Dim url, host_url, no_http, host_name As String "定义变量
url = HttpContext.Current.Request.Url.ToString "获取当前页的URL
no_http = url.Substring(url.IndexOf("//") + 2) "截取去掉HTTP://的URL
host_url = "http://" & no_http.Substring(0, no_http.IndexOf("/") + 1) "组合成当前网站的域名