sitecore默认的404页面为/sitecore/service/notfound.aspx
更改Sitecore.config中的以下节点,可配置自定义404页面的item
<setting name="ItemNotFoundUrl" value="/xxxx/no-find" />
<setting name="LayoutNotFoundUrl" value="/xxxx/no-find" />
<setting name="LinkItemNotFoundUrl" value="/xxxx/no-find" />