用JavaScript获取style属性

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            line-height: 100px;
            margin: 0 auto;
            color: brown;
            text-align: center;
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div>获取样式</div>
    <script>
        var div = document.querySelector('div')
        //封装方法进行兼容
        function getStyle(element,attribute){
            //先获取需要获取样式的元素对象
            var style = window.getComputedStyle?window.getComputedStyle(element):element.currentStyle
            //再获取元素属性
            return style[attribute]
        }
        console.log(getStyle(div,'width'));
    </script>
</body>
</html>