js判断android和ios

window.onload =function(){

    var browser={
        versions:function(){
            var u = navigator.userAgent,app = navigator.appVersion;
            return {
                trident: u.indexOf('Trident') > -1, 
                presto: u.indexOf('Presto') > -1, 
                webKit: u.indexOf('AppleWebKit') > -1,
                gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1,
                mobile: !!u.match(/AppleWebKit.*Mobile.*/)||!!u.match(/AppleWebKit/),
                ios: !!u.match(/(i[^;]+;(U;)? CPU.+Mac OS X)/),
                android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,
                iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1,
                iPad: u.indexOf('iPad') > -1,
                webApp: u.indexOf('Safari') == -1
            }
        }()
    }
    
    if(browser.versions.ios){
        //alert("苹果手机");
        var img = document.createElement("img");
        img.src = "images/app-asbdpos-bg.png";
        img.style.width = "100%";
        document.body.appendChild(img);
        setTimeout("window.location.href='https://xxxxxxx'",3000)
    }
    
    if(browser.versions.android){
        //alert("安卓手机");
        var img = document.createElement("img");
        img.src = "images/app-asbdpos-bg.png";
        img.style.width = "100%";
        document.body.appendChild(img);
            var ua = window.navigator.userAgent.toLowerCase();
    if(ua.match(/MicroMessenger/i) == 'micromessenger'){
        return;
    }else{
        setTimeout("window.location.href='https://xxxx'",3000)
        }
    }
}