js判断url换主域名进行链接跳转

    //跳转代码
   var Url001 = window.location.href;
   var arrUrl = Url001.split("//");
   var start = arrUrl[1].indexOf("/");
   var relUrl = arrUrl[1].substring(start); 
   window.location.href ="http://www.baidu.com"+relUrl;