Access itheima.com. 黑马程序员官网-IT培训机构|java培训|前端培训|python培训|大数据培训|鸿蒙开发培训

name

value

score

weighting

FCP (First Contentful Paint)

Value6.7 s

2/100

10%

LCP (Largest Contentful Paint)

Value26.1 s

0/100

25%

SI (Speed Index)

Value13.4 s

2/100

10%

TBT (Total Blocking Time)

Value270 ms

82/100

30%

CLS (Cumulative Layout Shift)

Value0.229

54/100

15%

TTI (Time to Interactive)

Value33.6 s

0/100

10%

itheima.com

4308 ms

www.itheima.com

7207 ms

wp-emoji-release.min.js

11200 ms

www.itheima.com

9787 ms

genericons.css

3304 ms

Our browser made a total of 133 requests to load all elements on the main page. We found that 79% of them (105 requests) were addressed to the original Itheima.com, 4% (5 requests) were made to Open.itheima.com and 3% (4 requests) were made to Hb.crm2.qq.com. The less responsive or slowest element that took the longest time to load (20.5 sec) belongs to the original domain Itheima.com.

Content Size

632.1 kB

After Optimization

357.0 kB

In fact, the total size of Itheima.com main page is 632.1 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 25% of websites need less resources to load. Images take 243.7 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 101.6 kB

Original 122.4 kB
After minification 103.6 kB
After compression 20.8 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 18.8 kB, which is 15% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 101.6 kB or 83% of the original size.

Image Optimization

-17%

Potential reduce by 42.4 kB

Original 243.7 kB
After minification 201.3 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, Itheima needs image optimization as it can save up to 42.4 kB or 17% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-46%

Potential reduce by 92.0 kB

Original 201.2 kB
After minification 199.6 kB
After compression 109.2 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 92.0 kB or 46% of the original size.

CSS Optimization

-60%

Potential reduce by 39.1 kB

Original 64.8 kB
After minification 59.0 kB
After compression 25.7 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Itheima.com needs all CSS files to be minified and compressed as it can save up to 39.1 kB or 60% of the original size.

Requests Now

After Optimization

The browser has sent 82 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Itheima. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 20 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

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

High

<html> element does not have a [lang] attribute

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.

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

Search Engine Optimization Advices

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

High

robots.txt is not valid

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

High

Image elements do not have [alt] attributes

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](https://developers.google.com/search/mobile-sites/).

High

Document uses legible font sizes

Language and Encoding

Language Detected

ZH
Language Claimed

ZH
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Itheima.com can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and it matches the claimed language. Our system also found out that Itheima.com main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

itheima.com

Open Graph description is not detected on the main page of Itheima. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks:

Report Summary

Performance

Accessibility

Best Practices

SEO

黑马程序员官网-IT培训机构|java培训|前端培训|python培训|大数据培训|鸿蒙开发培训

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

itheima.com

www.itheima.com

wp-emoji-release.min.js

www.itheima.com

genericons.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

itheima.com

www.itheima.com

wp-emoji-release.min.js

www.itheima.com

genericons.css

style.css

jquery.js

jquery-migrate.min.js

shCore.js

shCoreDefault.css

jquery-1.10.2.min.js

init.css

style.css

index.css

banner.css

idangerous.swiper.min.js

www

stat.php

masonry.min.js

jquery.masonry.min.js

functions.js

wpa.php

hm.js

gongshang_logos.gif

198x57.png

59481457502937.jpg

android.png

apple.png

java.png

icd.png

1415438272.jpg

small_icon2.jpg

small_icon3.jpg

small_icon4.jpg

jiamen2.jpg

5.jpg

11.jpg

jiamen1.jpg

22.jpg

779.jpg

769.jpg

757.jpg

sh2.jpg