https://developers.weixin.qq.com/miniprogram/dev/api/media/video/wx.chooseMedia.html

文档中：

wx.chooseMedia({
  count: 9,
  mediaType: ['image','video'],
  sourceType: ['album', 'camera'],
  maxDuration: 30,
  camera: 'back',
  success(res) {
    console.log(res.tempFiles.tempFilePath)
    console.log(res.tempFiles.size)
  }
})

成功后返回值：

        console.log(res.tempFiles[0].tempFilePath);
        console.log(res.tempFiles[0].size);

否则结果为 ：undefined