wx.scanCode({
   scanType: ['barCode'],
    success(scanRes: any) {
   console.log('scanRes :>> ', scanRes)
   console.log('扫码类型：' + scanRes.scanType)
   console.log('扫码内容：' + scanRes.result)
   resolve(scanRes)
  },
  fail() {
     reject()
  }
})
安卓端任何机型扫码都是返回QR_CODE, api的scanType属性值填与不填都一样