combination/miniprogram/packageCloud/pages/storage/upload-file/upload-file.js

// 参考文档：https://developers.weixin.qq.com/miniprogram/dev/wxcloud/reference-client-api/storage/uploadFile.html

const app = getApp()

Page({
  onShareAppMessage() {
    return {
      title: '上传文件',
      path: 'packageCloud/pages/storage/upload-file/upload-file'
    }
  },

  data: {
    theme: 'light',
    fileUploaded: false,
    fileId: '',
    filePath: '',
    fromOtherPage: false
  },

  onLoad(options) {
    this.setData({
      theme: wx.getSystemInfoSync().theme || 'light'
    })

    if (wx.onThemeChange) {
      wx.onThemeChange(({theme}) => {
        this.setData({theme})
      })
    }
    if (options.from) {
      this.setData({
        fromOtherPage: true
      })
    }
  },

  chooseImage() {
    const self = this

    wx.chooseImage({
      count: 1,
      sizeType: ['compressed'],
      sourceType: ['album'],
      success(res) {
        console.log('chooseImage success, temp path is', res.tempFilePaths[0])
        const filePath = res.tempFilePaths[0]
        wx.showLoading({
          title: '上传中'
        })
        app.getUserOpenIdViaCloud()
          .then(openid => {
            const cloudPath = `upload/${openid}${filePath.match(/\.[^.]+?$/)[0]}`
            console.log('cloudPath', cloudPath)
            wx.cloud.uploadFile({
              cloudPath,
              filePath,
              success: res => {
                console.log('[上传文件] 成功：', res)
                app.globalData.fileId = res.fileID
                self.setData({
                  fileUploaded: true,
                  fileId: res.fileID,
                  filePath
                })
                wx.hideLoading()
              },
              fail: err => {
                console.error('[上传文件] 失败：', err)
                wx.hideLoading()
                wx.showToast({
                  icon: 'none',
                  title: '上传失败',
                })
              }
            })
            return openid
          })
          .catch(err => {
            console.error(err)
            wx.hideLoading()
          })
      },
      fail({errMsg}) {
        console.log('chooseImage fail, err is', errMsg)
      }
    })
  }
})