404页面嵌入下面这段js脚本
返回腾讯网
1<script type="text/javascript" src="http://www.qq.com/404/search_children.js" charset="utf-8"></script>返回既定地址
1<script type="text/javascript" src="http://www.qq.com/404/search_children.js" charset="utf-8" homePageUrl="/" homePageName="回到我的主页"></script>
