在平时的工作中有时候会碰到需要获取元素当前样式的问题，查了一下可以用getComputedStyle这个方法来获取元素计算后的样式（有些我们在css里面没有写的，浏览器默认的样式也可以获得）
getComputedStyle的使用
getComputedStyle接收两个参数，第一个参数是一个元素，第二个参数是一个可选的伪元素。
getComputedStyle方法返回一个包含所有样式的对象，可以通过length方法获取这个对象的长度。
获取元素某个css属性的值
获取元素css属性值的方法有两种，一种是通过getComputedStyle方法返回的对象调用getPropertyValue方法，这个方法接收一个属性名作为参数，返回属性值。(这个方法的参数不必采用驼峰的写法，如想要获取背景颜色，直接传入"background-color"即可)
另外一种方法是直接使用getComputedStyle方法返回的对象的索引。
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style> div{ background: red; width: 300px; height: 300px; } </style></head><body><div id="box" style="width: 100px"></div></body><script> var box = document.getElementById("box"); var styleList = window.getComputedStyle(box); console.log(styleList.length); //262 (chrome下) console.log(styleList.width); //100px console.log(styleList.height); //300px console.log(styleList.backgroundColor); //rgb(255, 0, 0) console.log(styleList.getPropertyValue("background-color")); //rgb(255, 0, 0)</script></html> 参考：https://css-tricks.com/get-value-of-css-rotation-through-javascript/
获取元素CSS值之getComputedStyle方法熟悉-张鑫旭
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PMThe article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
What is the purpose of the <iframe> tag? What are the security considerations when using it?Mar 20, 2025 pm 06:05 PMThe article discusses the <iframe> tag's purpose in embedding external content into webpages, its common uses, security risks, and alternatives like object tags and APIs.
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PMThis article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
What is the viewport meta tag? Why is it important for responsive design?Mar 20, 2025 pm 05:56 PMThe article discusses the viewport meta tag, essential for responsive web design on mobile devices. It explains how proper use ensures optimal content scaling and user interaction, while misuse can lead to design and accessibility issues.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
SublimeText3 Linux new version
SublimeText3 Linux latest version
