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JS 参考手册

JS 参考手册(字母排序)

JavaScript

JS Arrays JS Boolean JS Classes JS Dates JS Error JS Global JS Iterators JS JSON JS Maps JS Math JS Numbers JS Objects JS Operators JS Assignment JS Arithmetic JS Comparison JS Logical Operators JS Bitwise Operators JS Misc Operators JS Precedence JS Promises JS RegExp Patterns JS RegExp Reference JS Sets JS Statements JS Strings JS Typed Arrays JS Typed Reference

Window

Window Object Window Console Window History Window Location Window Navigator Window Screen

HTML DOM

HTML Documents HTML Elements HTML Attributes HTML Collection HTML NodeList HTML DOMTokenList HTML Styles
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 Events

HTML Events HTML Event Objects HTML Event Properties HTML Event Methods

Web APIs

API Canvas API Console API Fetch API Fullscreen API Geolocation API History API MediaQueryList API Storage API Validation API Web

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> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

Window getComputedStyle() 方法


实例

获取 DIV 的背景颜色值:

<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed background color for the test div is:<span id="demo"></span></p>

<script>
function myFunction() {
  var elem = document.getElementById("test");
  var theCSSprop = window.getComputedStyle(elem, null).getPropertyValue("background-color");
  document.getElementById("demo").innerHTML = theCSSprop;
}
</script>
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页面下方有更多实例。


定义和用法

getComputedStyle() 方法用于获取指定元素的 CSS 样式。

获取的样式是元素在浏览器中最终渲染效果的样式。

样式源可以包括:内部样式表、外部样式表、继承样式和浏览器默认样式。

getComputedStyle() 方法返回 CSSStyleDeclaration 对象


浏览器支持

表中的数字表示支持该方法的第一个浏览器版本。

方法
getComputedStyle() 11.0 9.0 4.0 5 11.5

语法

window.getComputedStyle(element, pseudoElement)

参数值

参数 描述
element 必需。要获取其样式的元素
pseudoElement 可选。要获取的伪元素

技术细节

返回值: 包含元素的 CSS 声明块的 CSSStyleDeclaration 对象。

更多实例

实例

从元素中获取所有的样式:

<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed styles for the test div are:<br><span id="demo"></span></p>

<script>
function myFunction(){
  var elem = document.getElementById("test");
  var txt;
  cssObj = window.getComputedStyle(elem, null)

  for (i = 0; i< cssObj.length; i++) {
    cssObjProp = cssObj.item(i)
    txt += cssObjProp + " = " + cssObj.getPropertyValue(cssObjProp) + "<br>";
  }
  document.getElementById("demo").innerHTML = txt;
}
</script>
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实例

获取测试 div 中第一个字母的字体大小(使用伪元素):

<div id="test" style="height: 50px;background-color: lightblue;">Test Div</div>
<p>The computed font size for div::first-letter in the test div is:<span id="demo"></span></p>

<script>
function myFunction(){
  var elem = document.getElementById("test");
  var theCSSprop = window.getComputedStyle(elem, ":first-letter").getPropertyValue("font-size");
  document.getElementById("demo").innerHTML = theCSSprop;
}
</script>
亲自试一试 »

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