Small micro-channel program saves images to albums (solve saveimagetophotosalbum: problems fail invalid file type and saveImageToPhotosAlbum: fail auth deny the problem)

　　 that the this = const 
    the let new new fileName = a Date () valueOf ();. 
    the let filePath = wx.env.USER_DATA_PATH + '/' + + fileName '.jpg' 
    wx.downloadFile ({ 
      URL: srcUrl, here // Interface the image address returned 
      filePath: filePath, 
      Success: function (RES) { 
        // save the picture to the album system 
        wx.saveImageToPhotosAlbum ({ 
          filePath: filePath, 
          Success (Data) { 
            the let filemgr = wx.getFileSystemManager () 
            fileMgr.unlink ({ 
              filePath : filePath, 
              Success () { 
                the console.log (222); 
              } 
            }) 
          },  
          Fail (Data) {
            wx.showToast ({
              title: data.errMsg, 
              icon: 'none', 
              DURATION: 2000 
            }) 
            IF (data.errMsg === "saveImageToPhotosAlbum: Fail auth deny") { 
              console.log ( "user initially refused, we would like to initiate a reauthorization ") 
              the console.log ( 'open window disposed') 
              wx.openSetting ({ 
                success (settingdata) { 
                  the console.log (settingdata) 
                  IF (settingdata.authSetting [ 'scope.writePhotosAlbum']) { 
                    the console.log ( 'Get permission success save, click again to give hints pictures into the album. ') 
                  } the else { 
                    console.log (' failure to obtain permission, do not give permission to give prompt can not use the normal '))
                  }
                }
              })
            }
          }
        })
      },
      fail: function (res) {
        
      }
    })