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读取元素的样式.html

<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #box1{
            width: 100px;
            height: 100px;
            background-color: plum;
        }
    </style>
</head>
<body>
    <button id="btn01">点我一下</button>
    <br><br>
    <div id="box1"></div>
</body>
<script>
    var box1 = document.getElementById("box1");
    var btn01 = document.getElementById("btn01");
    btn01.onclick = function(){
        // 读取box1的宽度
        // alert(box1.style.width);

        // 获取元素的当前显示的样式
        var obj = getComputedStyle(box1,null);
        alert(obj.width);
    }
</script>
</html>