JS判断是否来自手机移动端的访问,并跳转

var browserName_ = navigator.userAgent ;
    if(browserName_.indexOf("iPad")<&&browserName_.indexOf("Windows NT")<&&browserName_.indexOf("Macintosh")<){
            if(browserName_.indexOf("Linux")>){
                if(browserName_.indexOf("Mobile")>||browserName_.indexOf("U;")>){
                     location.href="http://xxx.xxx.com/";
                }
            }
            else{
                location.href="http://xxx.xxx.com/";
            }
    }