search
HomeWeb Front-endHTML TutorialWays to improve performance of reflow and redraw

Ways to improve performance of reflow and redraw

Jan 26, 2024 am 11:10 AM
Performance optimizationreflowRedraw

Ways to improve performance of reflow and redraw

How to optimize the performance of reflow and redraw requires specific code examples

Reflow and repaint are key concepts in web page performance optimization. Reflow refers to the process by which the browser calculates and re-renders the page layout, while redraw is the re-drawing of elements that already exist on the screen. These two processes have an important impact on web page performance, so optimizing the performance of reflow and redrawing is very important. This article will introduce some methods to optimize reflow and redraw, and give specific code examples.

  1. Avoid frequent operation of style attributes

Frequent operation of style attributes will cause frequent reflow and redrawing. To avoid this, you can use CSS classes to style and then switch classes via JavaScript. This reduces the number of style changes, thereby reducing reflows and redraws.

// 不推荐的写法
document.getElementById('element').style.width = '100px';
document.getElementById('element').style.height = '100px';

// 推荐的写法
document.getElementById('element').classList.add('big-element');
  1. Batch modification of style attributes

If you need to modify multiple style attributes at one time, you should try to put them in one code block instead of modifying them multiple times. This reduces the number of reflows and redraws.

// 不推荐的写法
document.getElementById('element').style.width = '100px';
document.getElementById('element').style.height = '100px';

// 推荐的写法
document.getElementById('element').style.cssText = 'width: 100px; height: 100px;';
  1. Using CSS3 animations

CSS3 animations can take advantage of the browser's hardware acceleration, thereby reducing the overhead of reflow and redraw. Most modern browsers have optimized CSS3 animations, so their performance is better than JavaScript animations.

.element {
  transition: width 0.5s ease;
}

/* 通过 JavaScript 修改宽度 */
document.getElementById('element').style.width = '100px';
  1. Use virtual DOM

Virtual DOM is an in-memory data structure that can efficiently perform calculations and comparisons, and then update the changed parts to the real DOM, thereby reducing the number of reflows and redraws.

Virtual DOM is often used with libraries or frameworks, here is a sample code using React:

// 不推荐的写法
ReactDOM.render(
  <div>
    <span>Hello</span>
    <span>World</span>
  </div>,
  document.getElementById('container')
);

// 推荐的写法
ReactDOM.render(
  <div>
    <span>Hello</span>
    <span>World</span>
  </div>,
  document.getElementById('container')
);
  1. Using separate multi-layer layers

Separating different elements of the page onto independent layers can reduce the scope of reflow and redrawing. Use the transform or will-change attributes to improve rendering performance by placing elements into a separate layer.

/* 创建独立图层 */
.element {
  will-change: transform;
  /* 或者使用 transform 属性 */
  transform: translateZ(0);
}

In summary, performance optimization of reflow and redrawing is very important. By avoiding frequent manipulation of style attributes, batch modification of style attributes, using CSS3 animations, using virtual DOM, and using separate multi-layer layers, we can effectively reduce the number of reflows and redraws, thereby improving the performance and user experience of web pages. .

(This article only provides some common optimization methods and code examples. The actual optimization process needs to be comprehensively considered and adjusted according to the specific situation)

The above is the detailed content of Ways to improve performance of reflow and redraw. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
The Versatility of HTML: Applications and Use CasesThe Versatility of HTML: Applications and Use CasesApr 30, 2025 am 12:03 AM

HTML is not only the skeleton of web pages, but is more widely used in many fields: 1. In web page development, HTML defines the page structure and combines CSS and JavaScript to achieve rich interfaces. 2. In mobile application development, HTML5 supports offline storage and geolocation functions. 3. In emails and newsletters, HTML improves the format and multimedia effects of emails. 4. In game development, HTML5's Canvas API is used to create 2D and 3D games.

What is the root tag in an HTML document?What is the root tag in an HTML document?Apr 29, 2025 am 12:10 AM

TheroottaginanHTMLdocumentis.Itservesasthetop-levelelementthatencapsulatesallothercontent,ensuringproperdocumentstructureandbrowserparsing.

Are the HTML tags and elements the same thing?Are the HTML tags and elements the same thing?Apr 28, 2025 pm 05:44 PM

The article explains that HTML tags are syntax markers used to define elements, while elements are complete units including tags and content. They work together to structure webpages.Character count: 159

What is the significance of <head> and <body> tag in HTML?What is the significance of <head> and <body> tag in HTML?Apr 28, 2025 pm 05:43 PM

The article discusses the roles of <head> and <body> tags in HTML, their impact on user experience, and SEO implications. Proper structuring enhances website functionality and search engine optimization.

What is the difference between <strong>, <b> tags and <em>, <i> tags?What is the difference between <strong>, <b> tags and <em>, <i> tags?Apr 28, 2025 pm 05:42 PM

The article discusses the differences between HTML tags , , , and , focusing on their semantic vs. presentational uses and their impact on SEO and accessibility.

Please explain how to indicate the character set being used by a document in HTML?Please explain how to indicate the character set being used by a document in HTML?Apr 28, 2025 pm 05:41 PM

Article discusses specifying character encoding in HTML, focusing on UTF-8. Main issue: ensuring correct display of text, preventing garbled characters, and enhancing SEO and accessibility.

What are the various formatting tags in HTML?What are the various formatting tags in HTML?Apr 28, 2025 pm 05:39 PM

The article discusses various HTML formatting tags used for structuring and styling web content, emphasizing their effects on text appearance and the importance of semantic tags for accessibility and SEO.

What is the difference between the 'id' attribute and the 'class' attribute of HTML elements?What is the difference between the 'id' attribute and the 'class' attribute of HTML elements?Apr 28, 2025 pm 05:39 PM

The article discusses the differences between HTML's 'id' and 'class' attributes, focusing on their uniqueness, purpose, CSS syntax, and specificity. It explains how their use impacts webpage styling and functionality, and provides best practices for

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.