文 件打不开

wx.downloadFile({
      url: dfile,
      success: function (res) {
        console.log("打开");
        const filePath = res.tempFilePath
          wx.openDocument({
            filePath: filePath,
            fileType:fType,
            showMenu:isdownload,
            success: function (res) {
              console.log('打开文档成功');
            },
            complete:function () {
              that.setData({
                isLoading: false
              });
              console.log('打开完成');
              wx.hideLoading();
            }
          });
      }
    })