<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.parent{
height:500px;
border:1px solid #222;
display:flex;/*设为伸缩容器*/
flex-flow:row;/*伸缩项目单行排列*/
}
.stable{
width:200px;/*固定宽度*/
border:1px solid #ccc;
margin:20px;
}
.change{
flex:1;/*这里设置为占比1，填充满剩余空间*/
border:1px solid #ff4400;
margin:20px;
}
</style>
</head>
<body>
<div class="parent">
<div class="stable">stable 固定宽度200px</div>
<div class="change">changeable 可变宽度</div>
</div>
</body>
</html>