搜素TODO:，以查看未完成的任务
======================================================以下是临时放在这儿
<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>滚动条宽度</title>
<style>
#box {
width: 200px;
height: 200px;
padding: 0;
margin: 0;
border: none;
overflow: scroll;
-ms-overflow-style: scrollbar;
background-color: #2f90b9;
}
#content {
background-color: #ffc90c;
}
</style>
</head>
<body>
<div id="box">
<div id="content"></div>
</div>
<script>
var box = document.getElementById( 'box' );
var content = document.getElementById( 'content' );
var scrollWidth = box.offsetWidth - box.clientWidth;
content.innerHTML = '滚动条宽度为：' + scrollWidth + 'px';
console.log(content.offsetWidth);
console.log(box.clientWidth);
</script>
</body>