Cnki.net 中国知网
中国知网知识发现网络平台—面向海内外读者提供中国学术文献、外文文献、学位论文、报纸、会议、年鉴、工具书等各类资源统一检索、统一导航、在线阅读和下载服务。涵盖基础科学、文史哲、工程科技、社会科学、农业、经济与管理科学、医药卫生、信息科技等十大领域。
cnki.net Mobile Performance
67/100
These metrics represent real-world Chrome users experience viewing cnki.net on mobile devices. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
First Input Delay
Largest Contentful Paint
Cumulative Layout Shift
First Contentful Paint
Metrics
Largest Contentful Paint36/100 4.6 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index57/100 5.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint59/100 3.6 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive75/100 5.1 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time99/100 150 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (13)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Eliminate render-blocking resources
Potential savings of 910 ms
908 ms
Remove unused JavaScript
Potential savings of 47 KiB
600 ms
Remove unused CSS
Potential savings of 11 KiB
450 ms
Minify CSS
Potential savings of 3 KiB
150 ms
Serve images in next-gen formats
Potential savings of 43 KiB
150 ms
Reduce initial server response time
Root document took 750 ms
149 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid `document.write()`
Does not use passive listeners to improve scrolling performance
Minimize main-thread work
3.0 s
Keep request counts low and transfer sizes small
66 requests • 235 KiB
Avoid chaining critical requests
20 chains found
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
4 long tasks found
Passed Audits (15)
Avoid multiple page redirects
Enable text compression
Minimize third-party usage
Third-party code blocked the main thread for 30 ms
Preload key requests
Uses efficient cache policy on static assets
4 resources found
Use video formats for animated content
Preconnect to required origins
Properly size images
Minify JavaScript
Avoids enormous network payloads
Total size was 235 KiB
Efficiently encode images
JavaScript execution time
0.5 s
Defer offscreen images
All text remains visible during webfont loads
Avoids an excessive DOM size
619 elements
cnki.net Mobile SEO
83/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (3)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Image elements do not have `[alt]` attributes
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. Learn more.
Tap targets are not sized appropriately
85% appropriately sized tap targets
Passed Audits (10)
Document avoids plugins
Document uses legible font sizes
100% legible text
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page has successful HTTP status code
Document has a meta description
Links have descriptive text
robots.txt is valid
Document has a valid `hreflang`
Document has a `<title>` element
Page isn’t blocked from indexing
cnki.net Mobile Best Practices
62/100
These checks highlight opportunities to improve the overall code health of cnki.net mobile page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (5)
Browser Compatibility
Page lacks the HTML doctype, thus triggering quirks-mode
Trust and Safety
Does not use HTTPS
29 insecure requests found
Links to cross-origin destinations are unsafe
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
General
Browser errors were logged to the console
Passed Audits (9)
Avoids requesting the geolocation permission on page load
Avoids deprecated APIs
Properly defines charset
Allows users to paste into password fields
Detected JavaScript libraries
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Avoids Application Cache
Displays images with correct aspect ratio
cnki.net Mobile Progressive Web App
46/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (9)
Installable
Does not use HTTPS
29 insecure requests found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
PWA Optimized
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Fast and reliable
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Passed Audits (5)
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page load is fast enough on mobile networks
Contains some content when JavaScript is not available
cnki.net Mobile Accessibility
25/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (9)
Names and labels
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.
Image elements do not have `[alt]` attributes
Links do not have a discernible name
Form elements do not have associated labels
Tables and lists
These are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are not contained within `<ul>` or `<ol>` parent elements.
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
`<html>` element does not have a `[lang]` attribute
Navigation
These are opportunities to improve keyboard navigation in your application.
The page does not contain a heading, skip link, or landmark region
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (3)
`[aria-hidden="true"]` is not present on the document `<body>`
Document has a `<title>` element
`[id]` attributes on active, focusable elements are unique
Mobile Usability
99/100
These checks validate how easily a visitor can use cnki.net on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
82/100
These checks analyze the performance of cnki.net on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (4)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Leverage browser caching
Enable compression
Passed Audits (6)
Avoid landing page redirects
Reduce server response time
Minify CSS
Minify HTML
Minify JavaScript
Prioritize visible content
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