一般站点都会有友情连接，但是你确并不知道别人在你的站点上都点了那些友情连接，这个东西可以实现!或者是适用于那些导航类站点，方便你统计通过本站点出的连接.-General site will have links, but you really do not know other people in your site on both of those links point, this thing can be achieved! Or is applicable to those types