這段代碼可以顯示用戶瀏覽器是否為移動(dòng)端

 !!navigator.userAgent.match(/(iPhone|iPod|Android|ios)/i)

返回值為布爾值

判斷移動(dòng)端橫豎屏

orient () {
      if (window.orientation === 90 || window.orientation === -90) {
        console.log('橫屏')
      } else if (window.orientation === 0 || window.orientation === 180) {
        console.log('豎屏')
      }
    }