uniapp 多图片上传

uploadImage(successBack) {
        uni.showToast({
          icon: 'loading',
          title: "正在添加"
        });
        this.uploadMoreImage([], 0, this.imgList.length, data => {
          uni.hideToast();
          successBack(data);
        }, () => {
          CommonUtils.showToast("上传失败");
          uni.hideToast();
        })

      },

      uploadMoreImage(backImgeUrl, index, length, successBack, errorBack) {
        uni.uploadFile({
          url: api.UPLOAD_IMAGE_URL, //仅为示例，非真实的接口地址
          filePath: this.imgList[index],
          name: 'file',
          success: (uploadFileRes) => {
            console.log(uploadFileRes.data);
            index++;
            if (index >= length) {
              backImgeUrl.push(JSON.parse(uploadFileRes.data).data);
              successBack(backImgeUrl);
            } else {
              backImgeUrl.push(JSON.parse(uploadFileRes.data).data);
              this.uploadMoreImage(backImgeUrl, index, length, successBack, errorBack);
            }
          },
          fail: () => {
            errorBack();
          }
        });
      },