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)
  }
})

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

res.tempFiles 是一个数组，文档示例代码直接对数组取 tempFilePath 和 size 都是空值