window.getComputedStyle 获取伪元素的style

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最新推荐文章于 2024-03-04 17:01:15 发布

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>window.getComputedStyle</title>
    <style>
        div {
            width: 300px;
            height: 300px;
            background-color: lightcoral;
            border: solid 1px #999; /*BFC原理去掉margin重叠*/
        }
        div::after {
            content: "";
            display: block;
            width: 50px;
            height: 50px;
            background-color: blue;
            margin: 50% auto;
        }
    </style>
</head>
<body>

    <div></div>
    <script>
        var divEle = document.getElementsByTagName("div")[0];
        var divStyle = window.getComputedStyle(divEle, null); //null是啥
        console.log(divStyle.width); //300px

        //获取伪元素的style
        var divAfterStyle = window.getComputedStyle(divEle, "after");
        console.log(divAfterStyle.width); //50px
    </script>
</body>
</html>