wx.chooseImage({
  success (res) {
    const tempFilePaths = res.tempFilePaths
    wx.uploadFile({
      url: 'https://example.weixin.qq.com/upload', //仅为示例，非真实的接口地址
      filePath: tempFilePaths[0],
      name: 'file',
      formData: {
        'user': 'test'
      },
      success (res){
        const data = res.data
        //do something
      }
    })
  }
})

const listener = function (res) { console.log(res) }

DownloadTask.onProgressUpdate(listener)
DownloadTask.offProgressUpdate(listener) // 需传入与监听时同一个的函数对象

const listener = function (res) { console.log(res) }

UploadTask.onHeadersReceived(listener)
UploadTask.offHeadersReceived(listener) // 需传入与监听时同一个的函数对象

const uploadTask = wx.uploadFile({
  url: 'http://example.weixin.qq.com/upload', //仅为示例，非真实的接口地址
  filePath: tempFilePaths[0],
  name: 'file',
  formData:{
    'user': 'test'
  },
  success (res){
    const data = res.data
    //do something
  }
})

uploadTask.onProgressUpdate((res) => {
  console.log('上传进度', res.progress)
  console.log('已经上传的数据长度', res.totalBytesSent)
  console.log('预期需要上传的数据总长度', res.totalBytesExpectedToSend)
})

uploadTask.abort() // 取消上传任务