在这里插入代码片
```<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
div {
width: 50px;
height: 20px;
margin: 0 auto;
text-align: center;
}
li {
list-style: none;
}
.yc {
display: none;
}
.xs {
display: block;
}
</style>
</head>
<body>
<div class="box">微博</div>
<div class="yc">
<li>私信</li>
<li>留言</li>
<li>emo</li>
</div>
<script type="text/javascript">
var box = document.querySelector('.box');
var yc = document.querySelector('.yc');
box.onmousemove = function() {
yc.className = 'xs';
}
box.onmouseout = function() {
yc.className = 'yc';
}
</script>
</body>
</html>
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