deviceType()
    window.addEventListener('resize', function(){
        deviceType()
    })

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

let ua = navigator.userAgent;
  // 移动端
  isMobile: ("ontouchstart" in window || navigator.msMaxTouchPoints) ? true : false,
  // 微信
  isWechat: /micromessenger/gi.test(ua),
  // qq
  isQQ: /qq/gi.test(ua),
  // VV音乐
  isvvmusic: /vvmusic/gi.test(ua),
  // 安卓
  isAndroid: /android/gi.test(ua),
  // iOS
  isIOS: /iphone|ipad|ipod|itouch/gi.test(ua), // IOS

const UA = window.navigator.userAgent.toLowerCase();
“正则”.test(UA)

return {
  platform: platform || "pc"
};

    const { navigator: { userAgent = '' } = {} } = window
    if (userAgent) {
      const platforms = [
        "Android",
        "iPhone",
        "SymbianOS",
        "Windows Phone",
        "iPad",
        "iPod"
      ].map(item => item.toLowerCase())
      console.log(platforms.find(item => userAgent.toLowerCase().indexOf(item) > -1))
    }