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:\/\/[^/]+/, "");
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:\/\/[^/]+/, "");
本文标题：js 去掉url域名
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