各位前辈大家好，我想请问如何在这段代码中设置上传图片的最少个数，比如最少上传一张图片否则不能发布内容并且做出提示

  chooseImage: function () {
    var that = this;
    wx.chooseImage({
      count: 9 - that.data.cloudImgList.length,
      sizeType: ['original', 'compressed'],
      sourceType: ['album', 'camera'],
      success(res) {
        console.log(res.tempFilePaths)
        // 上传图片
        that.data.tempImgList = res.tempFilePaths
        that.uploadImages()
      },
    })
  },
  uploadImages() {
    var that = this;
    for (var i = 0; i < this.data.tempImgList.length; i++) {
      wx.cloud.uploadFile({
        cloudPath: `actionImages/${Math.random()}_${Date.now()}.${this.data.tempImgList[i].match(/\.(\w+)$/)[1]}`,
        filePath: this.data.tempImgList[i],
        success(res) {
          console.log(res.fileID)
          that.data.cloudImgList.push(res.fileID)
          that.setData({
            cloudImgList: that.data.cloudImgList
          })
        }
      })
    }
  },