判断是pc端，iPad或者手机端系统

    if (window.location.toString().indexOf('pref=padindex') != -1) {
} else {
    if (/AppleWebKit.*Mobile/i.test(navigator.userAgent) || /\(Android.*Mobile.+\).+Gecko.+Firefox/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))) {
        if (window.location.href.indexOf("?mobile")<0){
            try {
                if (/Android|Windows Phone|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
                    window.location.href="手机浏览网址";
                } else if (/iPad/i.test(navigator.userAgent)) {
                    //window.location.href="iPad浏览网址"
                } else {
                    window.location.href="PC浏览器网址"
                }
            } catch (e) {}
        }
    }
}