代码编辑器：
x
1
2
<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 4
<style>5
body6
{7
background-image:url('/static/i/css/paper.gif');8
background-repeat:repeat-y;9
}10
</style>11
<p>repeat-y 设置只有垂直方向重复 background-image</p>12
<footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>13