判断当前设备是PC Android或者iOS

var userAgentInfo = navigator.userAgent;var isAndroid = userAgentInfo.indexOf('Android') > -1 || userAgentInfo.indexOf('Adr') > -1;//android终端var isiOS = !!userAgentInfo.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端var isPc = function IsPC() {//是否是PC    var Agents = ["Android", "iPhone",        "SymbianOS", "Windows Phone",        "iPad", "iPod"];    var isPC = true;    for (var v = 0; v < Agents.length; v++) {        if (userAgentInfo.indexOf(Agents[v]) > 0) {            isPC = false;            break;        }    }    return isPC;};