<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Page Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
/* 1.父级div的高度由内部的div内容撑开:
解决方案: 父级div的高度设置为auto,且设置overflow属性;当外层div设置固定的高度时,div内多余的内容的处理方案根据overflow来进行;若没有设置固定高度,则高度会被内层div撑开
2.里层div的高度始终与外层div的高度一样
解决方案: 利用绝对定位;top的值为0,bottom的值也为0 即可让里层div的高度与外层的高度一样
*/
.layout{
margin: 0 auto;
border: 1px solid red;
min-width: 200px;
height: auto;
width: 500px;
overflow: auto;
position: relative;
}
.left{
float: left;
width: 50px;
min-height: 50px;
border-right: 1px solid greenyellow;
}
.right{
position: absolute;
right: 0;
top: 0;
bottom: 0;
width: 50px;
border-left: 1px solid green;
}
</style>
</head>
<body>
<button onclick="addHeigth()">点击一下</button>
<div class="layout">
<div class="left" id="left"></div>
<div class="right"></div>
</div>
<script>
function addHeigth () {
var node = document.getElementById('left')
// clientHeight 为浏览器计算出来的属性(只读)
node.style.height = node.clientHeight + 200 +'px'
}
</script>
</body>
</html>