const doSave = (filePath) => {
      wx.saveImageToPhotosAlbum({
        filePath,
        success: () => {
          wx.hideLoading();
          wx.showToast({ title: '已保存到相册', icon: 'success' });
        },
        fail: (err) => {
          wx.hideLoading();
          if (err.errMsg && err.errMsg.indexOf('auth deny') !== -1) {
            wx.showModal({
              title: '提示',
              content: '需要您授权保存图片到相册',
              confirmText: '去授权',
              success: (r) => {
                if (r.confirm) wx.openSetting();
              },
            });
          } else {
            wx.showToast({ title: '保存失败', icon: 'none' });
          }
        },
      });
    };