//清除浮动
.clearfix{
&:after{
content:"";
display: block;
clear: both;
}
zoom:1;
}
.fl(@fl:left){
float:@fl;
}
.box{
@box_w:616px;
width:@box_w;
background-color: green;
margin-right:-32px;
.item{
@h:164px;
@w:130px;
@mr:32px;
.fl();
color:black;
height: @h;
width:@w;
text-align: center;
margin-right: @mr;
background-color: blue;
}
2019-08-09
因为你 margin-right: -32px的元素没有父元素
所有代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.main {
width: 616px;
height: 300px;
background-color: red;
}
.item-box {
/* 通过margin-right 变大item-box宽度，但必须有父元素 */
margin-right: -32px;
height: 200px;
background-color: blue;
}
.item {
width: 130px;
height: 100px;
float: left;
margin-right: 32px;
background-color: green;
}
</style>
</head>
<body>
<div class="main">
<div class="item-box">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
</div>
</body>
</html>
举报
