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flex.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type='text/css'>
.item{
width:100px;
height:100px;
background-color: orange;
border-radius: 10%;
}
.fourth{
display: flex;
flex-wrap: wrap;
/*不加不会显示column的效果 */
align-content: space-around;
/* 多行才使用content */
}
.column{
display: flex;
flex-basis: 100%;
/* 优先级大于width 受max-width min-width影响 */
/* 当容器没有足够大的空间来存放所有的items，flex items会按照压缩率(shrink rate)被压缩 */
/* 如果将每个item设置flex-grow：1 所有的item都会等比例的增长来填充剩余的空间 */
justify-content: space-around;
}
.point{
width: 20px;
height: 20px;
background-color: black;
margin: 5px;
}
</style>
</head>
<body>
<div class='item fourth'>
<div class='column'>
<span class='point'></span>
<span class='point'></span>
</div>
<div class='column'>
<span class='point'></span>
<span class='point'></span>
</div>
</div>
</body>
</html>