$(function(){
            var u = navigator.userAgent;
            var isAndroid = u.indexOf(‘Android‘) > -1 || u.indexOf(‘Adr‘) > -1; //android终端
            var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
            if(isAndroid){
                alert("android");
            }else if(isiOS){
                alert("ios");
            }else{
            }
            var ua = window.navigator.userAgent.toLowerCase();
            if (ua.match(/MicroMessenger/i) == ‘micromessenger‘) {
                alert("微信");
            } else {
                alert("非微信");
            }
        });

if (/(iPhone|iPad|iPod|iOS|Android)/i.test(navigator.userAgent)) { 
    //移动端
}else{
    //pc端
}