原生JS判断设备来源

navigator.userAgent 客户端发送给服务器的设备信息

    //JS判断设备来源
  function deviceType(){
        var ua = navigator.userAgent;
        var agent = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
        for(var i=0,len = agent.length; i<len; i++){
            if(ua.indexOf(agent[i])>0){
                alert(agent[i])
                break
            }
        }
    }

    deviceType()
    window.addEventListener('resize', function(){
        // console.log(1)
        deviceType()
    })

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