js 判断 浏览器是否移动设备

        var system = {
            win: false,
            mac: false,
            xll: false,
            ipad: false
        };
        //检测平台   
        var p = navigator.platform;
        system.win = p.indexOf("Win") == 0;
        system.mac = p.indexOf("Mac") == 0;
        system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
        system.ipad = (navigator.userAgent.match(/iPad/i) != null) ? true : false;

        alert(navigator.platform);

        //跳转语句，如果是手机访问就自动跳转到wap.baidu.com页面   
        if (system.win || system.mac || system.xll || system.ipad) {
            alert("在PC端上打开的");

        } else {
            var ua = navigator.userAgent.toLowerCase();
            if (ua.match(/MicroMessenger/i) == "micromessenger") {
                alert("在手机端微信上打开的");
            } else {
                alert("在手机上非微信上打开的");
            }
        }


        var isWechart = function () {
            var rst = true
            if (window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
                var ua = navigator.userAgent.toLowerCase();
                if (!(ua.match(/MicroMessenger/i) == "micromessenger")) {
                    rst = false;
                }
            } else {
                rst = false;
            }
            return rst;
        }




        var os = function () {
            var ua = navigator.userAgent,
                isWindowsPhone = /(?:Windows Phone)/.test(ua),
                isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone,
                isAndroid = /(?:Android)/.test(ua),
                isFireFox = /(?:Firefox)/.test(ua),
                isChrome = /(?:Chrome|CriOS)/.test(ua),
                isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid && !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua)),
                isPhone = /(?:iPhone)/.test(ua) && !isTablet,
                isPc = !isPhone && !isAndroid && !isSymbian;
            return {
                isTablet: isTablet,
                isPhone: isPhone,
                isAndroid: isAndroid,
                isPc: isPc
            };
        }();



        // 判断浏览器函数
        function isMobile() {
            if (window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
                return true;  // 移动端
            } else {
                return false;  // PC端
            }

        }


        if (isWechart()) {
            alert("isWechart函数判断:这是微信浏览器。");

        } else {
            alert("isWechart函数判断:这不是微信浏览器。");
        }


        // 使用方法 
        if (os.isAndroid || os.isPhone) {
            alert("os函数判断:这是安卓或者苹果手机。");
        }
        else {
            alert("os函数判断:这不是安卓或者苹果手机。");
        }



        if (isMobile()) {
            alert("isMobile函数判断:这是移动端。");

        } else {
            alert("isMobile函数判断:这是PC端。");
        }