js判断是否微信浏览器、IE浏览器

/*判断（微信）浏览器*/

function isWeiXin(){
var ua = window.navigator.userAgent.toLowerCase();
if(ua.match(/MicroMessenger/i) == 'micromessenger'){
return true;
}else{
return false;
}
}
if(isWeiXin()){
alert(1);
}
else{
alert(2);
}

function isIe(){
if (!!window.ActiveXObject || "ActiveXObject" in window){
//是
mui. alert("是IE！");
}else{
//不是
mui.alert("不是IE！");
}
}
isIe();