<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style type="text/css">
a{
text-decoration: none;
}
li{
list-style: none;
}
.container3-head{
width: 1226px;
display: flex;
flex-direction: row;
justify-content: space-between;
}
.container3-pics{
width: 1226px;
height: 340px;
overflow: hidden;
}
.container3-pics ul{
display: flex;
flex-direction: row;
}
.container3-pics li{
width: 234px;
height: 300px;
padding-top: 39px;
margin-right: 14px;
background-color: #fafafa;
}
.container3-pics ul li img{
width: 160px;
height: 160px;
}
</style>
</head>
<body>
<div class="contaienr3">
<div class="container3-head">
<h2>小米明星单品</h2>
</div>
<div class="container3-pics">
<ul>
<li class="orange">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="green">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="blue">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="red">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="no-mr gray">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="orange">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="green">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="blue">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="red">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
<li class="no-mr gray">
<a href="#">
<img src="http://i3.mifile.cn/a4/ac9d56f1-65c6-4174-940b-b3c79aafe0a2">
</a>
</li>
</ul>
</div>
</div>
</body>
</html>
因为你用了flex布局,所有li的标签宽度总和超过浏览器宽度。他就按照li中的内容平分,你把li标签去掉几个,就会显示li的宽度