<!-- 判断浏览器是否为手机端 -->

 <script>

    // class

    ! function(navigator) {

        var userAgent = navigator.userAgent;

        documentElement = document.documentElement;

        if (userAgent.match(/micromessenger\/5/gi)) {

            documentElement.className += " mobile wx_mobile wx_mobile_5";

        } else if (userAgent.match(/micromessenger/gi)) {

            documentElement.className += " mobile wx_mobile";

        } else if (userAgent.match(/ucbrowser/gi)) {

            documentElement.className += " mobile uc_mobile";

        } else if (/android|webos|iphone|ipad|ipod|blackberry|iemobile|opera mini/i.test(userAgent.toLowerCase())) {

            documentElement.className += " mobile";

        } else if (userAgent.toLowerCase().match(/msie/gi) && (parseFloat(userAgent.toLowerCase().match(/msie ([0-9]{1,}[\.0-9]{0,})/i)[1] || 999) < 9)) {

            documentElement.className += " pc pc-ie pc-ie8";

        } else if (userAgent.toLowerCase().match(/msie/gi) || navigator.msPointerEnabled || navigator.pointerEnabled) {

            documentElement.className += " pc pc-ie";

        } else {

            documentElement.className += " pc";

            ispc = true;

        }

       /*  如果是Pc端，则打开下面这页面 */

        if(isPc){

              window.location.href='url';

        }

    }(navigator);

    // meta

    ! function(userAgent) {

        var screen_w = parseInt(window.screen.width),

            scale = screen_w / 640;

        if (/Android (\d+\.\d+)/.test(userAgent)) {

            var version = parseFloat(RegExp.$1);

            document.write(version > 2.3 ? '<meta name="viewport" content="width=640, minimum-scale = ' + scale + ", maximum-scale = " + scale + ', target-densitydpi=device-dpi">' : '<meta name="viewport" content="width=640 target-densitydpi=device-dpi">');

        } else {

            document.write('<meta name="viewport" content="width=640, user-scalable=no, target-densitydpi=device-dpi">');

        }

    }(navigator.userAgent);

</script>