Yoyzhou.github.io Zhou's Blog
在Hadoop上运行Mahout KMeans聚类分析 | Comments 上一篇文章“Mahout与聚类分析”介绍了如何使用Mahout进行聚类分析的步骤，并且结合实例使用K-Means对微博名人共同关注数据进行了共被关注聚类分析。Mahout运行有本地运行和Hadoop运行两种模式， …
yoyzhou.github.io Mobile Performance
60/100
These metrics represent real-world Chrome users experience viewing yoyzhou.github.io 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.
Metrics
Total Blocking Time0/100 3,730 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive45/100 7.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index72/100 4.5 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint92/100 2.2 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Largest Contentful Paint94/100 2.3 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (16)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Serve images in next-gen formats
Potential savings of 2,060 KiB
10,440 ms
Properly size images
Potential savings of 735 KiB
3,600 ms
Defer offscreen images
Potential savings of 2,291 KiB
140 ms
Eliminate render-blocking resources
Potential savings of 130 ms
131 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Ensure text remains visible during webfont load
Does not use passive listeners to improve scrolling performance
Reduce the impact of third-party code
Third-party code blocked the main thread for 2,730 ms
Avoid an excessive DOM size
6,134 elements
Minimize main-thread work
13.3 s
Serve static assets with an efficient cache policy
13 resources found
Reduce JavaScript execution time
3.5 s
Avoids enormous network payloads
Total size was 2,593 KiB
Avoid chaining critical requests
8 chains found
Keep request counts low and transfer sizes small
33 requests • 2,593 KiB
Avoid long main-thread tasks
20 long tasks found
Largest Contentful Paint element
1 element found
Passed Audits (12)
Minify CSS
Use video formats for animated content
Preload key requests
Initial server response time was short
Root document took 80 ms
Enable text compression
Minify JavaScript
Avoids `document.write()`
Remove unused JavaScript
Efficiently encode images
Preconnect to required origins
Avoid multiple page redirects
Remove unused CSS
yoyzhou.github.io Mobile SEO
93/100
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 (1)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Links do not have descriptive text
1 link found
Passed Audits (13)
Image elements have `[alt]` attributes
Document has a meta description
Document has a valid `hreflang`
Document uses legible font sizes
99.15% legible text
Document avoids plugins
Page has successful HTTP status code
Document has a `<title>` element
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page isn’t blocked from indexing
Links are crawlable
Tap targets are sized appropriately
100% appropriately sized tap targets
Document has a valid `rel=canonical`
robots.txt is valid
yoyzhou.github.io Mobile Best Practices
85/100
These checks highlight opportunities to improve the overall code health of yoyzhou.github.io 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 (2)
General
Browser errors were logged to the console
Trust and Safety
Does not use HTTPS
16 insecure requests found
Passed Audits (12)
Serves images with appropriate resolution
Avoids Application Cache
Properly defines charset
Displays images with correct aspect ratio
Links to cross-origin destinations are safe
Detected JavaScript libraries
Avoids deprecated APIs
Page has the HTML doctype
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids requesting the notification permission on page load
yoyzhou.github.io Mobile Progressive Web App
39/100
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 (10)
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
PWA Optimized
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not redirect HTTP traffic to HTTPS
Does not set a theme color for the address bar.
Does not provide a valid `apple-touch-icon`
Installable
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Does not use HTTPS
16 insecure requests found
Passed Audits (4)
Page load is fast enough on mobile networks
Contains some content when JavaScript is not available
Content is sized correctly for the viewport
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
yoyzhou.github.io Mobile Accessibility
86/100
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 (3)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
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.
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (17)
No element has a `[tabindex]` value greater than 0
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Image elements have `[alt]` attributes
`[aria-hidden="true"]` elements do not contain focusable descendents
The page contains a heading, skip link, or landmark region
`[id]` attributes on active, focusable elements are unique
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
`<html>` element has a `[lang]` attribute
Document has a `<title>` element
`[role]`s are contained by their required parent element
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]` values are valid
`[role]`s have all required `[aria-*]` attributes
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
Links have a discernible name
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`<html>` element has a valid value for its `[lang]` attribute
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