discuz不修改代码达到允许referer跳转到同顶级域名的解决方案

<script>
/* by qidizi: discuz 不允许跳转到其它域名,现使用js处理,减少修改的工作量,允许跳到同顶域--不能跳到其它域,防止仿站之类的欺骗*/
(function(){
var topDomain = location.host.split('.');
topDomain = topDomain[topDomain.length-2]+'.'+topDomain[topDomain.length-1];
if (location.hash.length < 3) return location = 'http://' +location.host + '/';
var referer = unescape(location.hash.replace(/#/g, '').replace('%_', '%'));
if (new RegExp('^http\\:\\/\\/([^\\/]+\\.)?' +topDomain+ '\\/', 'i').test(referer)) {//同top domain
location = referer;
} else {
location = 'http://' +location.host + '/';
}
})();
</script>