js判断是否是移动设备登陆网页的简单方法

var browser = {
            versions: function () {
                var u = navigator.useragent, app = navigator.appversion;
                return {//移动终端浏览器版本信息
                    trident: u.indexof('trident') > -1, //ie内核
                    presto: u.indexof('presto') > -1, //opera内核
                    webkit: u.indexof('applewebkit') > -1, //苹果、谷歌内核
                    gecko: u.indexof('gecko') > -1 && u.indexof('khtml') == -1, //火狐内核
                    mobile: !!u.match(/applewebkit.*mobile.*/) || !!u.match(/applewebkit/), //是否为移动终端
                    ios: !!u.match(/\(i[^;]+;( u;)? cpu.+mac os x/), //ios终端
                    android: u.indexof('android') > -1 || u.indexof('linux') > -1, //android终端或者uc浏览器
                    iphone: u.indexof('iphone') > -1 || u.indexof('mac') > -1, //是否为iphone或者qqhd浏览器
                    ipad: u.indexof('ipad') > -1, //是否ipad
                    webapp: u.indexof('safari') == -1 //是否web应该程序，没有头部与底部
                };
            } (),
            language: (navigator.browserlanguage || navigator.language).tolowercase()
        }
if (browser.versions.mobile == true || browser.versions.ios == true || browser.versions.android == true) {
            window.location.href = target;
        }