wx.getSetting({
            success(res) {
              if (!res.authSetting[\'scope.writePhotosAlbum\']) {
                wx.authorize({
                  scope: \'scope.writePhotosAlbum\',
                  success() {
                    console.log(\'授权成功\')
                  }
                })
              }
            }
          })

          var imgSrc = "http://wxserver.knowway.cn/uploadpic/xiangmu/zhongjinwenjuan/images/1/p1_bg.jpg"
          wx.downloadFile({
            url: imgSrc,
            success: function (res) {
              console.log(\'图片保存到本地\');
              console.log(res);
              wx.saveImageToPhotosAlbum({
                filePath: res.tempFilePath,
                success: function (data) {
                  console.log(data);
                },
                fail: function (err) {
                  console.log(err);
                  if (err.errMsg === "saveImageToPhotosAlbum:fail auth deny") {
                    console.log("用户一开始拒绝了，我们想再次发起授权")
                    console.log(\'打开设置窗口\')
                    wx.openSetting({
                      success(settingdata) {
                        console.log(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\')
                        }
                      }
                    })
                  }
                }
              })
            }
          })