区分苹果终端和安卓终端

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      var u = navigator.userAgent

      // android终端
      var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1

      // ios终端
      var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)

      if (isAndroid) {
        console.log('安卓')
        this.count = 1
      } else if (isiOS) {
        console.log('苹果')
        this.count = 2
      }