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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

59

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
www.cas.cn/gd/202603/W020260320367237873144_ORIGIN.jpg0.0 ms622.6 KiB
www.cas.cn/gd/202603/W020260304562615519478_ORIGIN.jpg0.0 ms456.8 KiB
www.cas.cn/yx/202603/W020260324417741201243.png0.0 ms454.2 KiB
www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpg0.0 ms387.9 KiB
www.cas.cn/gd/202603/W020260305339535003381_ORIGIN.jpg0.0 ms366.7 KiB
www.cas.cn/gj/202604/W020260421522038092312.png0.0 ms350.4 KiB
www.cas.cn/cm/202604/W020260421385309959198.png0.0 ms280.4 KiB
www.cas.cn/newmedia/dsp/202604/W020260420329652831168.png0.0 ms269.6 KiB
www.cas.cn/sygz/202604/W020260416563069960778.png0.0 ms267.7 KiB
www.cas.cn/gd/202603/W020260304562615738276_ORIGIN.jpg0.0 ms266.8 KiB
www.cas.cn/gd/202603/W020260305339535231140_ORIGIN.jpg0.0 ms233.6 KiB
www.cas.cn/gd/202601/W020260128305083603703_ORIGIN.jpg0.0 ms230.0 KiB
www.cas.cn/spx/202604/W020260420379180266731_ORIGIN.jpg0.0 ms217.0 KiB
www.cas.cn/images/z19_ewm3.jpg0.0 ms215.4 KiB
www.cas.cn/gd/202603/W020260303457407403045_ORIGIN.jpg0.0 ms212.4 KiB
www.cas.cn/spx/202604/W020260417530461254188_ORIGIN.jpg0.0 ms206.3 KiB
www.cas.cn/yw/202604/W020260414668107692283_ORIGIN.jpg0.0 ms192.9 KiB
www.cas.cn/images/20260309_navkjqk.png0.0 ms187.3 KiB
www.cas.cn/newmedia/dsp/202604/W020260421546988627746.png0.0 ms167.1 KiB
www.cas.cn/syky/202604/W020260421315832007785_ORIGIN.jpg0.0 ms141.8 KiB
www.cas.cn/images/20230731zcjd.jpg0.0 ms129.0 KiB
www.cas.cn/gd/202601/W020260121576547305038_ORIGIN.jpg0.0 ms123.3 KiB
www.cas.cn/images/z19_foot_m.jpg0.0 ms122.8 KiB
www.cas.cn/gd/202601/W020260121572218060263_ORIGIN.jpg0.0 ms121.2 KiB
www.cas.cn/gd/202603/W020260303457407615596_ORIGIN.jpg0.0 ms120.0 KiB
www.cas.cn/gd/202601/W020260128305083857947_ORIGIN.jpg0.0 ms118.4 KiB
www.cas.cn/lib/css/hover.css0.0 ms116.2 KiB
www.cas.cn/spx/202604/W020260418314827276324_ORIGIN.jpg0.0 ms115.0 KiB
www.cas.cn/lib/js/plugin/wza/esdtoolsinit.js0.0 ms100.9 KiB
www.cas.cn/lib/js/jquery.min.js0.0 ms95.1 KiB
www.cas.cn/zt1/202604/W020260401410085460301.jpg0.0 ms94.8 KiB
www.cas.cn/images/swiper.min.js0.0 ms94.4 KiB
www.cas.cn/zt1/202603/W020260320378579484579.jpg0.0 ms88.3 KiB
www.cas.cn/images/zjzkymob_202303.jpg0.0 ms86.4 KiB
www.cas.cn/zt1/202604/W020260401410081532588.jpg0.0 ms82.5 KiB
www.cas.cn/zz/yld/201605/W020190929739561066807.jpg0.0 ms81.1 KiB
www.cas.cn/kxyj/202512/W020251218633030399800.jpg0.0 ms75.0 KiB
www.cas.cn/zz/yld/201704/W020190929738332637068.jpg0.0 ms73.3 KiB
www.cas.cn/kxyj/202512/W020251218541107090958_ORIGIN.jpg0.0 ms71.2 KiB
www.cas.cn/images/zjxbmob_202303.jpg0.0 ms70.6 KiB
www.cas.cn/images/z19_kxyj_img2.jpg0.0 ms69.7 KiB
www.cas.cn/syzc/202312/W020231229530488598921_ORIGIN.jpg0.0 ms56.4 KiB
www.cas.cn/images/z19_tj_img1.jpg0.0 ms53.2 KiB
www.cas.cn/zz/yld/201803/W020191125383560116474.jpg0.0 ms49.3 KiB
www.cas.cn/images/zjzkypc_202303.jpg0.0 ms47.3 KiB
www.cas.cn/lib/js/plugin/swiper/idangerous.swiper.min.js0.0 ms44.4 KiB
www.cas.cn/kx/202404/W020240510574946875857_ORIGIN.jpg0.0 ms43.9 KiB
www.cas.cn/zz/yld/202504/W020250416559005659783_ORIGIN.jpg0.0 ms40.3 KiB
www.cas.cn/images/zkyzsmob_202303.jpg0.0 ms38.8 KiB
www.cas.cn/images/z2025_dqgz1.jpg0.0 ms37.9 KiB
www.cas.cn/images/z19_dqgz2.jpg0.0 ms37.4 KiB
www.cas.cn/zz/yld/202308/W020240329553856002424_ORIGIN.jpg0.0 ms36.5 KiB
www.cas.cn/zz/yld/202409/W020240912524118761361_ORIGIN.jpg0.0 ms36.2 KiB
www.cas.cn/images/dsb02_20251217.png0.0 ms36.0 KiB
www.cas.cn/zz/yld/202404/W020240407367171999355_ORIGIN.jpg0.0 ms34.7 KiB
www.cas.cn/images/zjxbpc_202303.jpg0.0 ms34.5 KiB
www.cas.cn/zz/yld/202504/W020250406365313605807_ORIGIN.jpg0.0 ms34.0 KiB
www.cas.cn/zz/yld/202311/W020231122659760924736.jpg0.0 ms33.6 KiB
www.cas.cn/zz/yld/202504/W020250406366075798999_ORIGIN.jpg0.0 ms31.3 KiB
www.cas.cn/zz/yld/201909/W020201118270525579945.jpg0.0 ms30.5 KiB
www.cas.cn/kx/202404/W020240510575174145626_ORIGIN.jpg0.0 ms29.0 KiB
www.cas.cn/images/z19_styleMobile.css?v=1.00.0 ms26.9 KiB
www.cas.cn/images/z19_public.css?v=202512180.0 ms24.6 KiB
www.cas.cn/newmedia/dsp/202604/W020260421276040437486.jpg0.0 ms23.5 KiB
www.cas.cn/images/20220826kejitop.jpg0.0 ms23.3 KiB
www.cas.cn/cg/112072/images/P020190929620050824644.jpg0.0 ms22.8 KiB
www.cas.cn/images/yjzxgl_202203826.jpg0.0 ms21.4 KiB
www.cas.cn/lib/js/plugin/swiper/swiper.min.css0.0 ms19.5 KiB
www.cas.cn/images/dsb01_20251217.png0.0 ms18.2 KiB
www.cas.cn/images/z19_logo.png0.0 ms16.3 KiB
www.cas.cn/images/z19_tj_img3.jpg0.0 ms15.2 KiB
www.cas.cn/images/z19_school_bar1.jpg0.0 ms13.8 KiB
www.cas.cn/images/z19_index.css?v=202512250.0 ms13.2 KiB
www.cas.cn/images/z19_main.js?v=1.00.0 ms13.0 KiB
www.cas.cn/images/z19_school_bar3.jpg0.0 ms12.3 KiB
www.cas.cn/images/z19_stylePad.css0.0 ms12.1 KiB
www.cas.cn/images/z19_school_bar2.jpg0.0 ms11.7 KiB
www.cas.cn/images/z19_school3.jpg0.0 ms10.3 KiB
www.cas.cn/images/z19_school2.jpg0.0 ms9.5 KiB
www.cas.cn/images/z19_school1.jpg0.0 ms8.0 KiB
www.cas.cn/images/z19_close.png0.0 ms6.3 KiB
www.cas.cn/images/z22_jl_xfqd.png0.0 ms5.3 KiB
www.cas.cn/images/z19_jl_icon4.png0.0 ms5.2 KiB
www.cas.cn/images/z19_index_yw2.png0.0 ms4.6 KiB
www.cas.cn/images/z19_jl_icon2.png0.0 ms4.6 KiB
www.cas.cn/images/z19_gopc.png0.0 ms4.4 KiB
www.cas.cn/images/jiucuo.png0.0 ms4.1 KiB
www.cas.cn/images/z19_jl_icon5.png0.0 ms3.7 KiB
www.cas.cn/images/wza_2024.png0.0 ms3.3 KiB
www.cas.cn/lib/js/plugin/jquery.cookie.js0.0 ms3.3 KiB
www.cas.cn/images/z19_scroll_wb.png0.0 ms3.2 KiB
www.cas.cn/images/z19_return_m.png0.0 ms3.0 KiB
www.cas.cn/images/z19_jl_bg_m.jpg0.0 ms2.6 KiB
www.cas.cn/images/z19_scroll_wx.png0.0 ms2.6 KiB
www.cas.cn/images/blue.png0.0 ms2.5 KiB
www.cas.cn/images/z19_search_m.png0.0 ms2.4 KiB
www.cas.cn/images/z19_yw_2025tab_m2.png0.0 ms2.3 KiB
www.cas.cn/images/z19_index_yw1.png0.0 ms2.2 KiB
www.cas.cn/images/z19_pc_m.png0.0 ms2.2 KiB
www.cas.cn/images/z19_index_xk1.png0.0 ms2.0 KiB
www.cas.cn/images/z19_h5.js0.0 ms2.0 KiB
www.cas.cn/images/z19_video_play.png0.0 ms1.9 KiB
www.cas.cn/images/z19_en_m.png0.0 ms1.7 KiB
www.cas.cn/images/z19_index_tz2.png0.0 ms1.7 KiB
www.cas.cn/images/z19_news_list_m.png0.0 ms1.6 KiB
www.cas.cn/images/foot_jgawb.png0.0 ms1.6 KiB
www.cas.cn/images/z19_index_tj.png0.0 ms1.6 KiB
www.cas.cn/images/z19_nav_up.png0.0 ms1.4 KiB
www.cas.cn/images/z19_index_xk2.png0.0 ms1.4 KiB
www.cas.cn/lib/js/plugin/topSide.min.js0.0 ms1.4 KiB
www.cas.cn/images/z19_xk_list_m.png0.0 ms1.3 KiB
www.cas.cn/images/z19_resize.js0.0 ms1.3 KiB
www.cas.cn/images/z19_index_tz1.png0.0 ms1.2 KiB
www.cas.cn/images/z19_bg_blue2.png0.0 ms1.2 KiB
www.cas.cn/images/z19_index_ky1.png0.0 ms1.2 KiB
www.cas.cn/images/z19_scroll_top.png0.0 ms1.1 KiB
www.cas.cn/images/z19_index_ft1.png0.0 ms1.0 KiB
www.cas.cn/images/z19_index_video1.png0.0 ms1.0 KiB
www.cas.cn/images/z19_index_video2.png0.0 ms1020 B
www.cas.cn/images/z19_jl_img.png0.0 ms919 B
www.cas.cn/images/z19_index_zt1.png0.0 ms877 B
www.cas.cn/images/z19_index_ky2.png0.0 ms750 B
www.cas.cn/images/z19_index_ft2.png0.0 ms750 B
www.cas.cn/images/z19_index_gz2.png0.0 ms727 B
www.cas.cn/images/z19_index_gz1.png0.0 ms689 B
www.cas.cn/images/z19_xk_tab_m.png0.0 ms665 B
www.cas.cn/images/z19_bg_blue.png0.0 ms539 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpg387.7 KiB332.1 KiB
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow
www.cas.cn/sygz/202604/W020260416563069960778.png267.5 KiB237.6 KiB
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260304562615738276_ORIGIN.jpg266.6 KiB210.9 KiB
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260305339535231140_ORIGIN.jpg233.4 KiB177.8 KiB
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
www.cas.cn/spx/202604/W020260417530461254188_ORIGIN.jpg206.1 KiB170.8 KiB
div.tab_con > div.video_left > a > img div.tab_con > div.video_left > a > img
www.cas.cn/spx/202604/W020260420379180266731_ORIGIN.jpg216.8 KiB163.3 KiB
div.tab_con > div.yw_img > a > img.hvr-grow div.tab_con > div.yw_img > a > img.hvr-grow
www.cas.cn/yw/202604/W020260414668107692283_ORIGIN.jpg192.7 KiB162.8 KiB
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow
www.cas.cn/syky/202604/W020260421315832007785_ORIGIN.jpg141.6 KiB111.7 KiB
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
www.cas.cn/zt1/202604/W020260401410085460301.jpg94.6 KiB82.1 KiB
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
www.cas.cn/spx/202604/W020260418314827276324_ORIGIN.jpg114.8 KiB79.5 KiB
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
www.cas.cn/zt1/202603/W020260320378579484579.jpg88.1 KiB75.5 KiB
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
www.cas.cn/zt1/202604/W020260401410081532588.jpg82.2 KiB69.7 KiB
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202601/W020260121572218060263_ORIGIN.jpg121.0 KiB65.4 KiB
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260303457407615596_ORIGIN.jpg119.8 KiB64.2 KiB
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock
www.cas.cn/images/zjzkymob_202303.jpg86.2 KiB62.7 KiB
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202601/W020260128305083857947_ORIGIN.jpg118.2 KiB62.5 KiB
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock
www.cas.cn/images/zjxbmob_202303.jpg70.4 KiB46.9 KiB
div.clearfix > div.videopad > a > img div.clearfix > div.videopad > a > img
www.cas.cn/syzc/202312/W020231229530488598921_ORIGIN.jpg56.1 KiB26.4 KiB
div.top2 > div.container > a.xsdlogotop > img.logo div.top2 > div.container > a.xsdlogotop > img.logo
www.cas.cn/images/z19_logo.png16.0 KiB12.4 KiB
ul.videoBox > li.videopad > a > img ul.videoBox > li.videopad > a > img
www.cas.cn/images/zkyzsmob_202303.jpg38.6 KiB6.6 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:2257.736 label:Time to first byte subpart:timeToFirstByte] map[duration:275.692 label:Resource load delay subpart:resourceLoadDelay] map[duration:3318.44 label:Resource load duration subpart:resourceLoadDuration] map[duration:33.04 label:Element render delay subpart:elementRenderDelay]]
lhId: page-20-IMG
nodeLabel: ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
path: 1,HTML,1,BODY,14,DIV,2,DIV,0,DIV,0,UL,1,LI,1,A,0,IMG
selector: ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
snippet: <img src="./gd/202603/W020260304562615738276_ORIGIN.jpg" class="focus_img_m">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-20-IMG
nodeLabel: ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
path: 1,HTML,1,BODY,14,DIV,2,DIV,0,DIV,0,UL,1,LI,1,A,0,IMG
selector: ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
snippet: <img src="./gd/202603/W020260304562615738276_ORIGIN.jpg" class="focus_img_m">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.cas.cn/http/1.1
www.cas.cn/lib/js/plugin/swiper/swiper.min.csshttp/1.1
www.cas.cn/lib/css/hover.csshttp/1.1
www.cas.cn/images/z19_public.css?v=20251218http/1.1
www.cas.cn/images/z19_index.css?v=20251225http/1.1
www.cas.cn/images/z19_styleMobile.css?v=1.0http/1.1
www.cas.cn/images/z19_logo.pnghttp/1.1
www.cas.cn/images/dsb01_20251217.pnghttp/1.1
www.cas.cn/images/dsb02_20251217.pnghttp/1.1
www.cas.cn/images/z19_pc_m.pnghttp/1.1
www.cas.cn/images/z19_en_m.pnghttp/1.1
www.cas.cn/images/wza_2024.pnghttp/1.1
www.cas.cn/images/z19_search_m.pnghttp/1.1
www.cas.cn/images/z19_close.pnghttp/1.1
www.cas.cn/zz/yld/201803/W020191125383560116474.jpghttp/1.1
www.cas.cn/zz/yld/202404/W020240407367171999355_ORIGIN.jpghttp/1.1
www.cas.cn/zz/yld/201704/W020190929738332637068.jpghttp/1.1
www.cas.cn/zz/yld/201909/W020201118270525579945.jpghttp/1.1
www.cas.cn/zz/yld/201605/W020190929739561066807.jpghttp/1.1
www.cas.cn/zz/yld/202308/W020240329553856002424_ORIGIN.jpghttp/1.1
www.cas.cn/zz/yld/202409/W020240912524118761361_ORIGIN.jpghttp/1.1
www.cas.cn/zz/yld/202311/W020231122659760924736.jpghttp/1.1
www.cas.cn/zz/yld/202504/W020250406365313605807_ORIGIN.jpghttp/1.1
www.cas.cn/zz/yld/202504/W020250406366075798999_ORIGIN.jpghttp/1.1
www.cas.cn/zz/yld/202504/W020250416559005659783_ORIGIN.jpghttp/1.1
www.cas.cn/kxyj/202512/W020251218541107090958_ORIGIN.jpghttp/1.1
www.cas.cn/kxyj/202512/W020251218633030399800.jpghttp/1.1
www.cas.cn/images/z19_kxyj_img2.jpghttp/1.1
www.cas.cn/images/20260309_navkjqk.pnghttp/1.1
www.cas.cn/images/20220826kejitop.jpghttp/1.1
www.cas.cn/cg/112072/images/P020190929620050824644.jpghttp/1.1
www.cas.cn/images/z19_stylePad.csshttp/1.1
www.cas.cn/images/z19_school1.jpghttp/1.1
www.cas.cn/images/z19_school2.jpghttp/1.1
www.cas.cn/images/z19_school3.jpghttp/1.1
www.cas.cn/images/z19_school_bar1.jpghttp/1.1
www.cas.cn/images/z19_school_bar2.jpghttp/1.1
www.cas.cn/images/z19_school_bar3.jpghttp/1.1
www.cas.cn/kx/202404/W020240510574946875857_ORIGIN.jpghttp/1.1
www.cas.cn/kx/202404/W020240510575174145626_ORIGIN.jpghttp/1.1
www.cas.cn/images/z2025_dqgz1.jpghttp/1.1
www.cas.cn/images/z19_dqgz2.jpghttp/1.1
www.cas.cn/gd/202603/W020260304562615519478_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260304562615738276_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260320367237873144_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260303457407403045_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260303457407615596_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260305339535003381_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202603/W020260305339535231140_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202601/W020260128305083603703_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202601/W020260128305083857947_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202601/W020260121576547305038_ORIGIN.jpghttp/1.1
www.cas.cn/gd/202601/W020260121572218060263_ORIGIN.jpghttp/1.1
www.cas.cn/syzc/202312/W020231229530488598921_ORIGIN.jpghttp/1.1
www.cas.cn/images/z19_index_yw1.pnghttp/1.1
www.cas.cn/images/z19_index_yw2.pnghttp/1.1
www.cas.cn/gj/202604/W020260421522038092312.pnghttp/1.1
www.cas.cn/yw/202604/W020260414668107692283_ORIGIN.jpghttp/1.1
www.cas.cn/images/z19_index_ky1.pnghttp/1.1
www.cas.cn/images/z19_index_ky2.pnghttp/1.1
www.cas.cn/syky/202604/W020260421315832007785_ORIGIN.jpghttp/1.1
www.cas.cn/cm/202604/W020260421385309959198.pnghttp/1.1
www.cas.cn/images/z19_index_gz1.pnghttp/1.1
www.cas.cn/images/z19_index_gz2.pnghttp/1.1
www.cas.cn/sygz/202604/W020260416563069960778.pnghttp/1.1
www.cas.cn/yx/202603/W020260324417741201243.pnghttp/1.1
www.cas.cn/images/z19_index_zt1.pnghttp/1.1
www.cas.cn/zt1/202604/W020260401410085460301.jpghttp/1.1
www.cas.cn/zt1/202604/W020260401410081532588.jpghttp/1.1
www.cas.cn/zt1/202603/W020260320378579484579.jpghttp/1.1
www.cas.cn/images/z19_jl_img.pnghttp/1.1
www.cas.cn/images/zjzkypc_202303.jpghttp/1.1
www.cas.cn/images/zjzkymob_202303.jpghttp/1.1
www.cas.cn/images/zjxbpc_202303.jpghttp/1.1
www.cas.cn/images/zjxbmob_202303.jpghttp/1.1
www.cas.cn/images/zkyzsmob_202303.jpghttp/1.1
www.cas.cn/images/z19_index_tz1.pnghttp/1.1
www.cas.cn/images/z19_index_tz2.pnghttp/1.1
www.cas.cn/images/z19_index_video1.pnghttp/1.1
www.cas.cn/images/z19_index_video2.pnghttp/1.1
www.cas.cn/spx/202604/W020260420379180266731_ORIGIN.jpghttp/1.1
www.cas.cn/images/z19_video_play.pnghttp/1.1
www.cas.cn/spx/202604/W020260418314827276324_ORIGIN.jpghttp/1.1
www.cas.cn/spx/202604/W020260417530461254188_ORIGIN.jpghttp/1.1
www.cas.cn/newmedia/dsp/202604/W020260421276040437486.jpghttp/1.1
www.cas.cn/newmedia/dsp/202604/W020260420329652831168.pnghttp/1.1
www.cas.cn/newmedia/dsp/202604/W020260421546988627746.pnghttp/1.1
www.cas.cn/images/z19_index_xk2.pnghttp/1.1
www.cas.cn/images/z19_index_xk1.pnghttp/1.1
www.cas.cn/images/z19_index_ft1.pnghttp/1.1
www.cas.cn/images/z19_index_ft2.pnghttp/1.1
www.cas.cn/images/20230731zcjd.jpghttp/1.1
www.cas.cn/images/swiper.min.jshttp/1.1
www.cas.cn/images/z19_jl_icon2.pnghttp/1.1
www.cas.cn/images/z19_jl_icon4.pnghttp/1.1
www.cas.cn/images/z19_jl_icon5.pnghttp/1.1
www.cas.cn/images/z22_jl_xfqd.pnghttp/1.1
www.cas.cn/images/z19_index_tj.pnghttp/1.1
www.cas.cn/images/z19_tj_img3.jpghttp/1.1
www.cas.cn/images/z19_tj_img1.jpghttp/1.1
www.cas.cn/images/yjzxgl_202203826.jpghttp/1.1
www.cas.cn/images/z19_scroll_wb.pnghttp/1.1
www.cas.cn/images/z19_scroll_wx.pnghttp/1.1
www.cas.cn/images/z19_ewm3.jpghttp/1.1
www.cas.cn/images/z19_scroll_top.pnghttp/1.1
www.cas.cn/images/z19_return_m.pnghttp/1.1
www.cas.cn/images/foot_jgawb.pnghttp/1.1
www.cas.cn/images/jiucuo.pnghttp/1.1
www.cas.cn/images/blue.pnghttp/1.1
www.cas.cn/images/z19_gopc.pnghttp/1.1
www.cas.cn/lib/js/jquery.min.jshttp/1.1
www.cas.cn/images/z19_h5.jshttp/1.1
www.cas.cn/lib/js/plugin/swiper/idangerous.swiper.min.jshttp/1.1
www.cas.cn/lib/js/plugin/jquery.cookie.jshttp/1.1
www.cas.cn/images/z19_main.js?v=1.0http/1.1
www.cas.cn/images/z19_resize.jshttp/1.1
www.cas.cn/lib/js/plugin/wza/esdtoolsinit.jshttp/1.1
www.cas.cn/lib/js/plugin/topSide.min.jshttp/1.1
www.cas.cn/images/z19_nav_up.pnghttp/1.1
www.cas.cn/images/z19_yw_2025tab_m2.pnghttp/1.1
www.cas.cn/images/z19_news_list_m.pnghttp/1.1
www.cas.cn/images/z19_xk_list_m.pnghttp/1.1
www.cas.cn/images/z19_bg_blue.pnghttp/1.1
www.cas.cn/images/z19_xk_tab_m.pnghttp/1.1
www.cas.cn/images/z19_bg_blue2.pnghttp/1.1
www.cas.cn/images/z19_jl_bg_m.jpghttp/1.1
www.cas.cn/images/z19_foot_m.jpghttp/1.1
www.cas.cn/lib/images/favicon.icohttp/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
www.cas.cn/lib/css/hover.css116.2 KiB1.7 s
www.cas.cn/images/z19_styleMobile.css?v=1.026.9 KiB1.1 s
www.cas.cn/images/z19_index.css?v=2025122513.2 KiB752 ms
www.cas.cn/images/z19_public.css?v=2025121824.6 KiB1.1 s
www.cas.cn/lib/js/plugin/swiper/swiper.min.css19.5 KiB602 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.4 s
URLTime Spent
cas.cn/773 ms
www.cas.cn/630 ms
www.cas.cn/0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 150 ms 23.9 KiB
URLTransfer SizeEst Savings
www.cas.cn/lib/css/hover.css116.2 KiB18.8 KiB
www.cas.cn/images/z19_public.css?v=2025121824.6 KiB3.0 KiB
www.cas.cn/images/z19_styleMobile.css?v=1.026.9 KiB2.1 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 900 ms 183.4 KiB
URLTransfer SizeEst Savings
www.cas.cn/lib/css/hover.css116.0 KiB115.7 KiB
www.cas.cn/images/z19_public.css?v=2025121824.4 KiB19.2 KiB
www.cas.cn/images/z19_styleMobile.css?v=1.026.7 KiB19.2 KiB
www.cas.cn/lib/js/plugin/swiper/swiper.min.css19.3 KiB17.5 KiB
www.cas.cn/images/z19_stylePad.css11.9 KiB11.9 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 600 ms 110.5 KiB
URLTransfer SizeEst Savings
www.cas.cn/images/swiper.min.js94.2 KiB59.9 KiB
www.cas.cn/lib/js/jquery.min.js94.9 KiB50.7 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.5 KiB
URLTransfer SizeEst Savings
www.cas.cn/images/z19_main.js?v=1.012.8 KiB2.5 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
www.cas.cn/gd/202603/W020260320367237873144_ORIGIN.jpg622.6 KiB
www.cas.cn/gd/202603/W020260304562615519478_ORIGIN.jpg456.8 KiB
www.cas.cn/yx/202603/W020260324417741201243.png454.2 KiB
www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpg387.9 KiB
www.cas.cn/gd/202603/W020260305339535003381_ORIGIN.jpg366.7 KiB
www.cas.cn/gj/202604/W020260421522038092312.png350.4 KiB
www.cas.cn/cm/202604/W020260421385309959198.png280.4 KiB
www.cas.cn/newmedia/dsp/202604/W020260420329652831168.png269.6 KiB
www.cas.cn/sygz/202604/W020260416563069960778.png267.7 KiB
www.cas.cn/gd/202603/W020260304562615738276_ORIGIN.jpg266.8 KiB

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Other1.8 s
Style & Layout282 ms
Rendering218 ms
Script Evaluation209 ms
Parse HTML & CSS51 ms
Script Parsing & Compilation35 ms

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
www.cas.cn/images/z19_tj_img3.jpg
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
www.cas.cn/images/z19_tj_img1.jpg
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
www.cas.cn/images/yjzxgl_202203826.jpg
div.top2 > div.container > a.xsdlogotop > img.logo div.top2 > div.container > a.xsdlogotop > img.logo
www.cas.cn/images/z19_logo.png
ul.tab_title > li.tab_title_yw1 > a > img ul.tab_title > li.tab_title_yw1 > a > img
www.cas.cn/images/z19_index_yw1.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_yw2.png
ul.jl_list > li.jl_col4 > a > img ul.jl_list > li.jl_col4 > a > img
www.cas.cn/images/z19_jl_icon4.png
ul.jl_list > li.jl_col5 > a > img ul.jl_list > li.jl_col5 > a > img
www.cas.cn/images/z19_jl_icon5.png
ul.jl_list > li.jl_col7 > a > img ul.jl_list > li.jl_col7 > a > img
www.cas.cn/images/z22_jl_xfqd.png
ul.jl_list > li.jl_col2 > a > img ul.jl_list > li.jl_col2 > a > img
www.cas.cn/images/z19_jl_icon2.png
li > span#_ideConac > a > img#imgConac li > span#_ideConac > a > img#imgConac
www.cas.cn/images/blue.png
li > span#_span_jiucuo > a > img li > span#_span_jiucuo > a > img
www.cas.cn/images/jiucuo.png
div.container > div.top_link_m > a#change_pc > img div.container > div.top_link_m > a#change_pc > img
www.cas.cn/images/z19_pc_m.png
div.container > div.top_link_m > a > img div.container > div.top_link_m > a > img
www.cas.cn/images/z19_en_m.png
div.container > div.top_link_m > a#toolbarSwitchmob > img div.container > div.top_link_m > a#toolbarSwitchmob > img
www.cas.cn/images/wza_2024.png
div.container > div.top_link_m > a > img#m_search div.container > div.top_link_m > a > img#m_search
www.cas.cn/images/z19_search_m.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_ky1.png
ul.tab_title > li > a > img ul.tab_title > li > a > img
www.cas.cn/images/z19_index_ky2.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_gz1.png
ul.tab_title > li > a > img ul.tab_title > li > a > img
www.cas.cn/images/z19_index_gz2.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_tz1.png
ul.tab_title > li > a > img ul.tab_title > li > a > img
www.cas.cn/images/z19_index_tz2.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_video1.png
ul.tab_title > li > a > img ul.tab_title > li > a > img
www.cas.cn/images/z19_index_video2.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_xk2.png
ul.tab_title > li > a > img ul.tab_title > li > a > img
www.cas.cn/images/z19_index_xk1.png
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
www.cas.cn/images/z19_index_ft1.png
ul.tab_title > li > a > img ul.tab_title > li > a > img
www.cas.cn/images/z19_index_ft2.png
div.divBox > div.div_title > p > img div.divBox > div.div_title > p > img
www.cas.cn/images/z19_index_zt1.png
div.divBox > div.jl > div.jl_left > img div.divBox > div.jl > div.jl_left > img
www.cas.cn/images/z19_jl_img.png
div.tj > div.div_title > p > img div.tj > div.div_title > p > img
www.cas.cn/images/z19_index_tj.png
div.boxcenter > div.foot_txt > p > img div.boxcenter > div.foot_txt > p > img
www.cas.cn/images/foot_jgawb.png

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Optimize DOM size
●Font display
●Forced reflow
●Optimize viewport for mobile
●Max Potential First Input Delay 40 ms
●JavaScript execution time 0.2 s
●Avoid long main-thread tasks 1 long task found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 280 ms
●Server Backend Latencies 0 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 280 ms
●Avoid large layout shifts 3 layout shifts found
○INP breakdown
○User Timing marks and measures
○Avoid non-composited animations
55

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
2026年04月14日 div.yw_img > h5 > div.date > span
2026年02月11日 div.tab_con > ul.tzgg > li > p
2026年04月20日 div.tab_con > ul.tzgg > li > p

These are opportunities to improve the legibility of your content.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

These are opportunities to improve the interpretation of your content by users in different locales.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.top2 > div.container > a.xsdlogotop > img.logo div.top2 > div.container > a.xsdlogotop > img.logo
div.container > div.top_link_m > a#change_pc > img div.container > div.top_link_m > a#change_pc > img
div.container > div.top_link_m > a > img div.container > div.top_link_m > a > img
div.container > div.top_link_m > a#toolbarSwitchmob > img div.container > div.top_link_m > a#toolbarSwitchmob > img
div.container > div.top_link_m > a > img#m_search div.container > div.top_link_m > a > img#m_search
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
div.clearfix > div.videopad > a > img div.clearfix > div.videopad > a > img
ul.tab_title > li.tab_title_yw1 > a > img ul.tab_title > li.tab_title_yw1 > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
div.tab_con > div.yw_img > a > img.hvr-grow div.tab_con > div.yw_img > a > img.hvr-grow
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock
ul.videoBox > li.videopad > a > img ul.videoBox > li.videopad > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.tab_con > div.video_left > a > img div.tab_con > div.video_left > a > img
div.tab_con > div.video_left > a > img.video_play2 div.tab_con > div.video_left > a > img.video_play2
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
div.video_right > div.video_img > a > img.video_play2 div.video_right > div.video_img > a > img.video_play2
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
div.video_right > div.video_img > a > img.video_play2 div.video_right > div.video_img > a > img.video_play2
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.divBox > div.div_title > p > img div.divBox > div.div_title > p > img
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
div.divBox > div.jl > div.jl_left > img div.divBox > div.jl > div.jl_left > img
ul.jl_list > li.jl_col2 > a > img ul.jl_list > li.jl_col2 > a > img
ul.jl_list > li.jl_col4 > a > img ul.jl_list > li.jl_col4 > a > img
ul.jl_list > li.jl_col5 > a > img ul.jl_list > li.jl_col5 > a > img
ul.jl_list > li.jl_col7 > a > img ul.jl_list > li.jl_col7 > a > img
div.tj > div.div_title > p > img div.tj > div.div_title > p > img
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
div.boxcenter > div.foot_txt > p > img div.boxcenter > div.foot_txt > p > img
li > span#_span_jiucuo > a > img li > span#_span_jiucuo > a > img
li > span#_ideConac > a > img#imgConac li > span#_ideConac > a > img#imgConac

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > div.top2 > div.container > a.xsdlogotop body > div.top2 > div.container > a.xsdlogotop
div.top2 > div.container > div.top_link_m > a#change_pc div.top2 > div.container > div.top_link_m > a#change_pc
div.top2 > div.container > div.top_link_m > a div.top2 > div.container > div.top_link_m > a
div.top2 > div.container > div.top_link_m > a#toolbarSwitchmob div.top2 > div.container > div.top_link_m > a#toolbarSwitchmob
div.top2 > div.container > div.top_link_m > a div.top2 > div.container > div.top_link_m > a
div.top2 > div.container > div.top_link_m > a div.top2 > div.container > div.top_link_m > a
body > div.container > div.topTitle > a body > div.container > div.topTitle > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a
div.container > div.clearfix > div.videopad > a div.container > div.clearfix > div.videopad > a
div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a
div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a
div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a
div.foot_img > li > span#_span_jiucuo > a div.foot_img > li > span#_span_jiucuo > a
div.foot_img > li > span#_ideConac > a div.foot_img > li > span#_ideConac > a

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
李昕欣：传感器研究从应用中来，到应用中去 徐新文：沙漠里编织“绿丝带” 包云岗：“科研重工业模式”践行者 科技为犁，耕护黑土粮仓 更多学者风采 + div.divBox3 > div.tabBox > div.tab_con > ul.xk_list
蔡长塔| 传承践行正确政绩观 勇担抢占科技制高点时代使命 王赤| 树立和践行正确政绩观，以实干实绩加快抢占空间科技制高点 向华| 以高水平科技自立自… div.divBox3 > div.tabBox > div.tab_con > ul.tzgg

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.foot > div.boxcenter > div.foot_img > li div.foot > div.boxcenter > div.foot_img > li
div.foot > div.boxcenter > div.foot_img > li div.foot > div.boxcenter > div.foot_img > li

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta head > meta
body > meta body > meta

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

These items highlight common accessibility best practices.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
按回车键在新窗口打开无障碍说明页面,按Ctrl+~键打开导盲模式。 body > a#esdTipLink1

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●ARIA attributes are used as specified for the element's role
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●Links are distinguishable without relying on color.
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Deprecated ARIA roles were not used
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○`[aria-hidden="true"]` elements do not contain focusable descendents
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○`[role]`s have all required `[aria-*]` attributes
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○`[role]` values are valid
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○Buttons have an accessible name
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has a valid value for its `[lang]` attribute
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○Elements with visible text labels have matching accessible names.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
50

Best Practices

Trust and Safety

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being served over HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more about HTTPS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Insecure URLRequest Resolution
www.cas.cn/Allowed

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
www.cas.cn/spx/202604/W020260418314827276324_ORIGIN.jpg328 x 216 (1.52)702 x 468 (1.50)
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
www.cas.cn/spx/202604/W020260417530461254188_ORIGIN.jpg328 x 216 (1.52)702 x 468 (1.50)
ul.tzgg > li > a > img ul.tzgg > li > a > img
www.cas.cn/images/20230731zcjd.jpg100 x 200 (0.50)700 x 200 (3.50)
div.model_box > div.model_top > a > img div.model_box > div.model_top > a > img
www.cas.cn/cg/112072/images/P020190929620050824644.jpg100 x 85 (1.18)1220 x 85 (14.35)

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260303457407615596_ORIGIN.jpg750 x 456750 x 4561125 x 684
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260305339535231140_ORIGIN.jpg750 x 456750 x 4561125 x 684
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
www.cas.cn/gd/202603/W020260320373519199299_ORIGIN.jpg750 x 456750 x 4561125 x 684
div.clearfix > div.videopad > a > img div.clearfix > div.videopad > a > img
www.cas.cn/syzc/202312/W020231229530488598921_ORIGIN.jpg750 x 217794 x 2301125 x 326
div.top2 > div.container > a.xsdlogotop > img.logo div.top2 > div.container > a.xsdlogotop > img.logo
www.cas.cn/images/z19_logo.png310 x 72310 x 72465 x 108
div.container > div.top_link_m > a#toolbarSwitchmob > img div.container > div.top_link_m > a#toolbarSwitchmob > img
www.cas.cn/images/wza_2024.png72 x 7276 x 76108 x 108
div.container > div.top_link_m > a > img div.container > div.top_link_m > a > img
www.cas.cn/images/z19_en_m.png72 x 7276 x 76108 x 108
div.container > div.top_link_m > a#change_pc > img div.container > div.top_link_m > a#change_pc > img
www.cas.cn/images/z19_pc_m.png72 x 7276 x 76108 x 108
div.container > div.top_link_m > a > img#m_search div.container > div.top_link_m > a > img#m_search
www.cas.cn/images/z19_search_m.png72 x 7276 x 76108 x 108

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
Specifying overflow: visible on img, video and canvas tags may cause them to produce visual content outside of the element bounds. See https://github.com/WICG/shared-element-transitions/blob/main/debugging_overflow_on_images.md.
www.cas.cn/

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
www.cas.cn/lib/js/plugin/wza/esdtoolsinit.js line 1321, col 17
TypeError: EsdToolbarInit.openCountFunc is not a function at EsdToolbarInit.openFunc_mobile (https://www.cas.cn/lib/js/plugin/wza/esdtoolsinit.js:1322:18) at EsdToolbarInit.init (https://www.cas.cn/lib/js/plugin/wza/esdtoolsinit.js:166:20) at https://www.cas.cn/lib/js/plugin/wza/esdtoolsinit.js:1425:17
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
73

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.top2 > div.container > a.xsdlogotop > img.logo div.top2 > div.container > a.xsdlogotop > img.logo
div.container > div.top_link_m > a#change_pc > img div.container > div.top_link_m > a#change_pc > img
div.container > div.top_link_m > a > img div.container > div.top_link_m > a > img
div.container > div.top_link_m > a#toolbarSwitchmob > img div.container > div.top_link_m > a#toolbarSwitchmob > img
div.container > div.top_link_m > a > img#m_search div.container > div.top_link_m > a > img#m_search
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m
div.clearfix > div.videopad > a > img div.clearfix > div.videopad > a > img
ul.tab_title > li.tab_title_yw1 > a > img ul.tab_title > li.tab_title_yw1 > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
div.tab_con > div.yw_img > a > img.hvr-grow div.tab_con > div.yw_img > a > img.hvr-grow
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock
ul.videoBox > li.videopad > a > img ul.videoBox > li.videopad > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.tab_con > div.video_left > a > img div.tab_con > div.video_left > a > img
div.tab_con > div.video_left > a > img.video_play2 div.tab_con > div.video_left > a > img.video_play2
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
div.video_right > div.video_img > a > img.video_play2 div.video_right > div.video_img > a > img.video_play2
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img
div.video_right > div.video_img > a > img.video_play2 div.video_right > div.video_img > a > img.video_play2
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img
ul.tab_title > li > a > img ul.tab_title > li > a > img
div.divBox > div.div_title > p > img div.divBox > div.div_title > p > img
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img
div.divBox > div.jl > div.jl_left > img div.divBox > div.jl > div.jl_left > img
ul.jl_list > li.jl_col2 > a > img ul.jl_list > li.jl_col2 > a > img
ul.jl_list > li.jl_col4 > a > img ul.jl_list > li.jl_col4 > a > img
ul.jl_list > li.jl_col5 > a > img ul.jl_list > li.jl_col5 > a > img
ul.jl_list > li.jl_col7 > a > img ul.jl_list > li.jl_col7 > a > img
div.tj > div.div_title > p > img div.tj > div.div_title > p > img
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img
div.boxcenter > div.foot_txt > p > img div.boxcenter > div.foot_txt > p > img
li > span#_span_jiucuo > a > img li > span#_span_jiucuo > a > img
li > span#_ideConac > a > img#imgConac li > span#_ideConac > a > img#imgConac

Format your HTML in a way that enables crawlers to better understand your app’s content.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
无障碍 div.container > div.top_r > div.top_link > a#toolbarSwitch
div.top2 > div.container > div.top_link_m > a#toolbarSwitchmob div.top2 > div.container > div.top_link_m > a#toolbarSwitchmob
按回车键在新窗口打开无障碍说明页面,按Ctrl+~键打开导盲模式。 body > a#esdTipLink1
配色 div#toolbar > ul > li > a#toolbar_colorChange
阅读 div#toolbar > ul > li > a#toolbar_speakVolume
设置 div#toolbar > ul > li > a#toolbar_config
退出 div#toolbar > ul > li > a#toolbar_exit

To appear in search results, crawlers need access to your app.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Page has successful HTTP status code
●Links have descriptive text
●Document has a valid `hreflang`
○robots.txt is valid
○Document has a valid `rel=canonical`

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