老师请看下是否规范
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>display属性</title>
<style type="text/css">
body,div,h3,ul{
margin:0;
padding:0;
font-family:"微软雅黑";
}
li{
list-style:none;
margin:5px;
text-align:center;
}
.big{
margin:0 auto;
width:100px;
}
h3{
background-color:gray;
border:1px solid black;
text-align:center;
}
ul{
border:1px solid gray;
display:none;
}
div div:hover ul{
display:block;
}
</style>
</head>
<body>
<div class="big">
<div class="div1">
<h3>家电</h3>
<ul class="elec">
<li>冰箱</li>
<li>洗衣机</li>
<li>空调</li>
</ul>
</div>
<div class="div2">
<h3>洗护</h3>
<ul class="wash">
<li>洗衣液</li>
<li>消毒液</li>
<li>柔顺剂</li>
</ul>
</div>
<div class="div3">
<h3>衣物</h3>
<ul class="clothes">
<li>衬衫</li>
<li>裤子</li>
<li>卫衣</li>
</ul>
</div>
</div>
</body>
</html>0
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