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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <style> #grad1 { height: 55px; background: -webkit-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Safari 5.1 - 6.0 */ background: -o-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Opera 11.1 - 12.0 */ background: -moz-linear-gradient(left, red, orange, yellow, green, blue, indigo, violet); /* Firefox 3.6 - 15 */ background: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet); /* 标准的语法（必须放在最后） */ } </style> <div id="grad1" style="text-align:center;margin:auto;color:#888888;font-size:40px;font-weight:bold"> 渐变背景 </div> <p><strong>注意：</strong> Internet Explorer 9 及之前的版本不支持渐变。</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
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