javaScript使用navigator.userAgent.toLowerCase()判断移动端类型

var ua   = navigator.userAgent.toLowerCase();   
if(ua.match(/android/i)) == "android")  
{  
    alert("android");  
}  
if(ua.match(/iPhone/i)) == "iPhone")  
{  
    alert("iPhone");  
}  
if(ua.match(/iPad/i)) == "iPad")  
{  
    alert("iPad");  
}  
if(ua.match(/weibo/i) == "weibo"){  
    alert("weibo");  
}
if(ua.indexOf('qq/')!= -1){  
    alert("qq");  
}
if(ua.match(/MicroMessenger/i)=="micromessenger"){  
    alert("微信");  
}