javascript判断是电脑还是手机，android手机还是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;
}
if(IsPC()){
//此处是电脑要执行的操作
}else{
//此处是手机要执行的操作
}

var ua = navigator.userAgent.toLowerCase();
var isWeixin = ua.indexOf('micromessenger') != -1;
if (!isWeixin) {
alert('非微信')
}