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');       },     });   },