微信小程序开发中怎样实现图片上传

handleCancelPic() {        let id = this.data.dbId;
        wx.chooseImage({
          count: 3, // 默认9
          sizeType: ['compressed'], // 可以指定是原图还是压缩图，默认二者都有          sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
          success: res => {
            // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
            var tempFilePaths = res.tempFilePaths;

            this.setData({
                src: tempFilePaths
            })
            upload(this,tempFilePaths,'','');
          }
        })
    }
然后一个封装好的方法function upload(page, path,way,id) {
    console.log(path)
  wx.showToast({
    icon: "loading",
    title: "正在上传"
  });
  var test = [],
    that = this;  for (var i = 0; i        wx.uploadFile({
          url: api.CancelImg,
          filePath: path[i],          
          name: 'file',
          header: { "Content-Type": "multipart/form-data" },
          success: res => {
            test.push(res);
            wx.setStorageSync('cancelImg',test)
            console.log(test)            if (res.statusCode != 200) { 
              wx.showModal({
                title: '提示',
                content: '上传失败',
                showCancel: false
              })              return;
            }else {
                wx.showModal({
                    title: '提示',
                    content: '上传成功',
                    showCancel: false
                }) 
            }
          },
          fail: function (e) {
            console.log(e);
            wx.showModal({
              title: '提示',
              content: '上传失败',
              showCancel: false
            })
          },
          complete: function () {
            wx.hideToast();  //隐藏Toast
          }
        })
    }