savefiles(e) {

    const fileName = e.currentTarget.dataset.name; //获取页面要下载的文件名

    console.log(window.wx.env.USER_DATA_PATH);

    wx.downloadFile({

      url: fileName,

      success: res => {

        console.log(res);

        wx.saveFile({

          filePath: res.tempFilePath,

          success(r) {

            wx.showToast({

              title: '保存成功',

              icon: 'success',

            });

          },

          fail(err) {

            console.log(err);

            if (err.errMsg === 'saveImageToPhotosAlbum:fail auth deny') {

              wx.openSetting({

                success(settingdata) {

                  if (settingdata.authSetting['scope.writePhotosAlbum']) {

                    console.log(

                      '获取权限成功，给出再次点击图片保存到相册的提示。'

                    );

                  } else {

                    console.log(

                      '获取权限失败，给出不给权限就无法正常使用的提示'

                    );

                  }

                },

              });

            }

          },

        });

      },

      fail: err => {

        console.log(err, '下载失败');

      },

    });

  },