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JS 参考

按类别分类的 JS 按字母顺序排列的 JS

JavaScript

JS 数组 JS 布尔值 JS 类 JS 日期 JS 错误 JS 全局 JS JSON JS 地图 JS 数学 JS 数字 JS 对象 JS 运算符 JS 优先级 JS Promise JS RegExp JS 集合 JS 语句 JS 字符串 JS TypedArray

窗口

窗口对象 窗口控制台 窗口历史记录 窗口地址 窗口导航 窗口屏幕

HTML DOM

HTML 文档 HTML 元素 HTML 属性 HTML 集合 HTML 节点列表 HTML DOMTokenList HTML 样式
alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundClip backgroundColor backgroundImage backgroundOrigin backgroundPosition backgroundRepeat backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide caretColor clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cssFloat cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right scrollBehavior tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex

HTML 事件

HTML 事件 HTML 事件对象 HTML 事件属性 HTML 事件方法

Web API

API 画布 API 控制台 API 获取 API 全屏 API 地理位置 API 历史记录 API 媒体查询列表 API 存储 API 验证 API 网页

HTML 对象

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

其他参考

CSSStyleDeclaration JS 转换


Window getComputedStyle()

示例

获取元素的计算背景颜色

const element = document.getElementById("test");
const cssObj = window.getComputedStyle(element, null);

let bgColor = cssObj.getPropertyValue("background-color");
尝试一下 »

更多示例请看下面。


描述

The getComputedStyle() 方法获取 HTML 元素的计算 CSS 属性和值。

The getComputedStyle() 方法返回一个 CSSStyleDeclaration 对象


计算样式

计算样式是在应用所有样式源后在元素上使用的样式。

样式源:外部和内部样式表、继承样式和浏览器默认样式。


语法

window.getComputedStyle(element, pseudoElement)

参数

参数 描述
element 必需的。
要获取计算样式的元素。
pseudoElement 可选的。
要获取的伪元素。

返回值

类型 描述
一个对象包含元素所有 CSS 属性和值的 CSSStyleDeclaration 对象。


更多示例

获取元素的所有计算样式

const element = document.getElementById("test");
const cssObj = window.getComputedStyle(element, null);

let text = "";
for (x in cssObj) {
  cssObjProp = cssObj.item(x)
  text += cssObjProp + " = " + cssObj.getPropertyValue(cssObjProp) + "<br>";
}
尝试一下 »

获取元素第一个字母的计算字体大小(使用伪元素)

const element = document.getElementById("test"); const cssObj = window.getComputedStyle(element, ":first-letter")

let size = cssObj.getPropertyValue("font-size");
尝试一下 »

浏览器支持

getComputedStyle() 在所有浏览器中都受支持

Chrome Edge Firefox Safari Opera IE
9-11


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