wx.downloadFile({
      url: 'https://www.onezl.cn/Content/File/Video/2.mp4', 
      success (res) {
        console.log(res) // 此处没有值输出
        if (res.statusCode === 200) {
            wx.saveVideoToPhotosAlbum({
              filePath: res.tempFilePath,
              fail: (res) => {
                console.log(res)
              },
              success: (res) => {
                wx.showToast({
                  title: '下载成功！',
                  duration: 1500,
                })
              },
            })
      
        }
      }
    })

// 如果可以的话请大佬提供一个小dome学习一下