微信小程序下载文件名问题

wx.saveFile和wx.getFileSystemManager().saveFile的区别wx.saveFile之后调用wx.openDocument得到的是临时文件地址和临时文件名，原文件名就没了，所以先保存原文件名。再用wx.getFileSystemManager().saveFile将文件名替换回来downLoad1: function(e) {    let dataset = e.currentTarget.dataset    let idx = dataset.idx;    var that = this;    let uri = that.data.beforeList[idx].fileUri;    let fileName = that.data.beforeList[idx].fileName;    wx.downloadFile({      url: uri,      success: function(res) {        console.log(res);        const manage = wx.getFileSystemManager();        if (res.statusCode === 200) {          manage.saveFile({            tempFilePath: res.tempFilePath,            filePath: wx.env.USER_DATA_PATH + “/” + fileName,            success: function(res) {            }          });          // 打开文档          wx.openDocument({            filePath: wx.env.USER_DATA_PATH + “/” + fileName,            success: function(res) {              console.log(‘打开文档成功’)            },            fail: function() {              console.log(‘打开失败’);            }          })        }        // // 只要服务器有响应数据，就会把响应内容写入文件并进入 success 回调，业务需要自行判断是否下载到了想要的内容        // if (res.statusCode === 200) {        //   // 将临时地址转存到本地缓存中        //   wx.saveFile({        //     tempFilePath: res.tempFilePath,        //     success: function(res) {        //       console.log(res);        //       var savedFilePath = res.savedFilePath;        //       console.log(‘文件已下载到’ + savedFilePath);        //       // 查看下载的文件列表        //       wx.getSavedFileList({        //         success: function(res) {        //           console.log(res);        //         }        //       })        //       // 打开文档        //       wx.openDocument({        //         filePath: savedFilePath,        //         success: function(res) {        //           console.log(‘打开文档成功’)        //         },        //         fail: function() {        //           console.log(‘打开失败’);        //         }        //       })        //     }        //   })        // }      }    })  },注释部分的问题就是下载文件打开后文件名有问题，且文件类型也不对微信小程序