string url = Request.Url.AbsoluteUri; //结果: http://www.mystudy.cn/web/index.aspx
string host = Request.Url.Host; //结果：www.mystudy.cn
string rawUrl = Request.RawUrl; //结果：/web/index.aspx
string localPath = Request.Url.LocalPath; //结果：/web/index.aspx

VAR url = document.URL; //结果：http://www.mystudy.cn/web/index.aspx
var href = document.location.href; //结果：http://www.mystudy.cn/web/index.aspx
var host = location.hostname; //结果：www.mystudy.cn