SPAN中的内容效果不对
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>标题</title>
<link rel="stylesheet" href="file://E:\bootstrap\bootstrap-3.3.7-dist\css\bootstrap.min.css">
</head>
<body>
<h1>标题一</h1>
<h2>标题二</h2>
<h3>标题三</h3>
<h4>标题四</h4>
<h5>标题五</h5>
<h6>标题六</h6>
<span class="h1">标题一</span>
<span class="h2">标题一</span>
<span class="h3">标题一</span>
<span class="h4">标题一</span>
<span class="h5">标题一</span>
<span class="h6">标题一</span>
</body>
</html>
