部分瀏覽器判斷，，可以部分判斷是否爲移動版

var browser = {
    versions: function () {
        var u = navigator.userAgent, app = navigator.appVersion;
        return {
            trident: u.indexOf('Trident') > -1, //IE內核               
            presto: u.indexOf('Presto') > -1, //opera內核               
            webKit: u.indexOf('AppleWebKit') > -1, //蘋果、谷歌內核               
            gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐內核
            mobile: !!u.match(/AppleWebKit.*Mobile/) || !!u.match(/Windows Phone/) || !!u.match(/Android/) || !!u.match(/MQQBrowser/),
            ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios終端               
            android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android終端或者uc瀏覽器               
            iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1, //是否爲iPhone或者QQHD瀏覽器               
            iPad: u.indexOf('iPad') > -1, //是否iPad               
            webApp: u.indexOf('Safari') == -1, //是否web應該程序，沒有頭部與底部  
            ismobile: u.indexOf('Mobile') > -1,
            isWindows: u.indexOf('Windows') > -1,
            isUC: u.indexOf('UCBrowser') > -1,
            isMaxthon: u.indexOf('Maxthon') > -1
        };
    }()

}

var isMobile = browser.versions.ismobile & !browser.versions.iPad;
var isWindows = browser.versions.isWindows;
var isAndroid = browser.versions.android;
var isUC = browser.versions.isUC;
var isMaxthon = browser.versions.isMaxthon;
var isIPad = browser.versions.iPad;