演示代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<!-- <link rel="stylesheet" type="text/css" href="reset.css"/> -->
<style type="text/css">
.box{
width: 400;margin: 100 auto;border: 1px solid #000;
}
img{
vertical-align: top;
border: none;
}
</style>
</head>
<body>
<!-- div.box>img -->
<div class="box">
<span>Yy</span>
<a href="">
<img src="bj.jpg" />
</a>
</div>
</body>
</html>
