10.21 杰克式跳跃（开合跳）
<head>
For online documentation and support please refer to
working. Further configuration is required.
width: 35em;
If you see this page, the tengine web server is successfully installed and
margin: 0 auto;
<title>Welcome to tengine!</title>
font-family: Tahoma, Verdana, Arial, sans-serif;
}
<html>
<style>
<!DOCTYPE html>
</head>
</style>
</html>
<body>
<a href="http://tengine.taobao.org/">tengine.taobao.org</a>.
body {
<em>Thank you for using tengine.</em>
</body>
<h1>Welcome to tengine!</h1>