<html>
<head>
<meta charset="UTF-8">
<title>
</title>
</head>
<style>
.contaier div{
background-color: : green;
border: 1px solid #000;
box-sizing: border-box;
width: 100%;
display: flex;
flex-wrap: wrap;
}
.col_50{
flex: 0 0 25%;
}
.col_30{
flex: 0 0 33.3%;
}
.col_60{
flex: 0 0 50%;
}
</style>
<body>
<div class="contaier">
<div >
<div class="col_50">
1
</div>
<div class="col_50">
1
</div>
<div class="col_50">
1
</div>
<div class="col_50">
1
</div>
<div class="col_30">
1
</div>
<div class="col_30">
1
</div>
<div class="col_30">
1
</div>
<div class="col_60">
1
</div>
<div class="col_60">
1
</div>
</div>
</div>
</body>
</html>详细的flex讲解：http://www.ruanyifeng.com/blog/2015/07/flex-grammar.html