盒子模型4-7编程练习知识点查考不清晰，指导下
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>display属性</title>
<style type="text/css">
body,div,h3,li{padding:0;margin:0;}
.big{width:100px;margin:0 auto;background-color:#dddddd;}
.div1,.div2,.div3{width:100%;height:30px;}
h3{line-height:30px;text-align:center;}
a{text-decoration:none;}
li{width:100%;height:20px;}
.div1 li{display:none;}
.div1:hover li{display:block;}
.div2 li{display:none;}
.div2:hover li{display:block;}
.div3 li{display:none;}
.div3:hover li{display:block;}
</style>
</head>
<body>
<div class="big">
<div class="div1">
<h3><a href="#">家电</a></h3>
<ul class="elec" type="none">
<li>冰箱</li>
<li>洗衣机</li>
<li>空调</li>
</ul>
</div>
<div class="div2">
<h3><a href="#">洗护</a></h3>
<ul class="wash" type="none">
<li>洗衣液</li>
<li>消毒液</li>
<li>柔顺剂</li>
</ul>
</div>
<div class="div3">
<h3><a href="#">衣物</a></h3>
<ul class="clothes" type="none">
<li>衬衫</li>
<li>裤子</li>
<li>卫衣</li>
</ul>
</div>
</div>
</body>
</html>
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>display属性</title>
<style type="text/css">
body,div,h3,li{padding:0;margin:0;}
.big{width:100px;margin:0 auto;background-color:#eeeeee;margin-top:30px;}
.div1,.div2,.div3{width:100px;margin:0 auto;}
h3{text-align:center;}
li{height:25px;width:100%;margin-left:-20px;font-size:15px;}
a{text-decoration:none;}
li{list-style:none;}
.div1 li{display:none;text-align:center;}
.div1:hover li{display:block;}
.div2 li{display:none;text-align:center}
.div2:hover li{display:block;}
.div3 li{display:none;text-align:center}
.div3:hover li{display:block;}
.wash,.elec,.clothes{list-style: none;text-align:center;}
</style>
</head>
<body>
<div class="big">
<div class="div1">
<h3><a href="#">家电</a></h3>
<ul class="elec" type="none">
<li>冰箱</li>
<li>洗衣机</li>
<li>空调</li>
</ul>
</div>
<div class="div2">
<h3><a href="#">洗护</a></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><a href="#">衣物</a></h3>
<ul class="clothes" >
<li>衬衫</li>
<li>裤子</li>
<li>卫衣</li>
</ul>
</div>
</div>
</body>
</html>
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