Flex 布局 几种常用形式汇总

1、不同的对齐方式，一种两端对齐，中间间隔相同；一种每个项目两侧间隔相同

<div class="container-1">
	<div class="item col-one-1"></div>
	<div class="item col-one-2"></div>
	<div class="item col-one-3"></div>
</div>
<div class="container-2">
	<div class="item col-one-1"></div>
	<div class="item col-one-2"></div>
	<div class="item col-one-3"></div>
</div>

.container-1{
	width: 1000px;
	margin: 20px auto;
	display: flex;
	flex-direction: row;
	justify-content: space-between;
}
.container-2{
	width: 1000px;
	margin: 20px auto;
	display: flex;
	flex-direction: row;
	justify-content: space-around;
}
.item{
	background: rgba(255,255,255,0.4);
	box-shadow: 0 3px 16px 0 rgba(31,32,41,.16);
	border-radius: 3px;
}
.col-one-1{
    width: 280px;
    height: 100px;
}
.col-one-2{
	width: 400px;
	height: 100px;
}
.col-one-3{
	width: 280px;
	height: 100px;
}

2、竖直方向上对齐方式，根据高度最高的项目自适应

<div class="container-3">
	<div class="item col-two-1"><p>haha</p><p>haha</p></div>
	<div class="item col-two-2"><p>haha</p></div>
	<div class="item col-two-3"><p>haha</p><p>haha</p><p>haha</p><p>haha</p></div>
</div>

.container-3{
	width: 1000px;
	margin: 20px auto;
	display: flex;
	flex-direction: row;
	justify-content: space-between;
	align-items: stretch;
}
.col-two-1{
	width: 280px;
}
.col-two-2{
	width: 400px;
}
.col-two-3{
	width: 280px;
}

3、用flex布局写一个hover效果 ，下图

<div class='user'></div>

.user{
  margin:40px auto;
  height:200px;
  width:200px;
  background-image: url('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1543578549607&di=873a1a556f33daaf0f7fbddc8d24d3ec&imgtype=0&src=http%3A%2F%2F5b0988e595225.cdn.sohucs.com%2Fimages%2F20170824%2F12f7e357710c4f5594248e7b034720af.jpeg');
  background-size:200px 200px;
  border-radius:50%;
  box-shadow:0px 0px 6px 1px rgba(0,0,0,0.3) inset;
  overflow:hidden;
}
.user:hover::after{
  content:'编辑';
  color:#ffffff;
  font-size:30px;
  font-weight:bold;
  cursor:pointer;
  display:flex;
  height: inherit;
  justify-content:center;
  align-items:center;
}

特别注意的一点，这里的height 要设置 inherit ，不然它会自动计算高度，垂直方向上就不居中了

（此效果学习了博主 https://www.jianshu.com/p/d1d78fdd5b78）

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