js 去掉url域名

方法一：

var url = "http://blog.csdn.net/jungsagacity/article/details/7645580";

url = '/' + url.split('/').slice(3).join('/');

方法二：

var url = "http://blog.csdn.net/jungsagacity/article/details/7645580";

url = url.replace(/^http:\/\/[^/]+/, "");