JS 判断设备来源

1、js代码判断当前设备：

function deviceType(){
    var ua = navigator.userAgent;
    var agent = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
    for(var i=; i<len,len = agent.length; i++){
        if(ua.indexOf(agent[i])>){
            break;
        }
    }
}
deviceType();
window.addEventListener('resize', function(){
    deviceType();
})

2、在微信中：

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