SOURCE

$(function () {
    var u = navigator.userAgent, app = navigator.appVersion;
    var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //g
    var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
    if (isAndroid) {
        //这个是安卓操作系统
        console.log("安卓");
    }
    if (isIOS) {
        //这个是ios操作系统
        console.log("ios");
    }
});

function IsPC() {
    var userAgentInfo = navigator.userAgent;
    var Agents = ["Android", "iPhone", "SymbianOS", "Windows Phone","iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}
console.log(IsPC());

/** * 是否为mac系统（包含iphone手机） * */ 
var isMac = function() { 
    return /macintosh|mac os x/i.test(navigator.userAgent); 
};
console.log("IOS"+isMac());