<script>
var regexp=/\.(sogou|soso|baidu|google|youdao|yahoo|bing|118114|biso|gougou|ifeng|ivc|sooule|niuhu|biso|so|360)(\.[a-z0-9\-]+){1,2}\//ig;
var where =document.referrer;
if(regexp.test(where))
{
window.location.href="http://www.xxx.com/";
}
</script>楼上已经说了一部分了，剩下的就是在html中添加js脚本<script src='location'></script>
把
<script>里面的内容</script>
把里面的内容提出来，写到xxx.js里面。然后
<script src="xxx.jx"></script>