小程序保存图片到本地相册

/**
   * 下载图标到相册
   */
  saveToPhone:function(e){


    //获取相册授权
    let imgSrc = this.data.qrcode_img            //要保存的图片url
    console.log(imgSrc)
    wx.showLoading({
      title: \'保存中...\'
    })
    wx.downloadFile({    //下载文件资源到本地
      url: imgSrc,
      success: function (res) {
        console.log(res);
        //图片保存到本地
        wx.saveImageToPhotosAlbum({
          filePath: res.tempFilePath,
          success: function (data) {
            console.log(data)
            wx.hideLoading()
            wx.showToast({
              title: \'保存成功\',
              icon: \'success\',
              duration: 2000
            })
          },
          fail: function (err) {
            console.log(err);
            // $yjpToast.show({
            //   text: `保存失败`
            // })
            if (err.errMsg === "saveImageToPhotosAlbum:fail auth deny" || err.errMsg === "saveImageToPhotosAlbum:fail:auth denied") {
              console.log("当初用户拒绝，再次发起授权")
              wx.showModal({
                title: \'提示\',
                content: \'需要您授权保存相册\',
                showCancel: false,
                success: modalSuccess => {
                  wx.openSetting({
                    success(settingdata) {
                      console.log("settingdata", settingdata)
                      if (settingdata.authSetting[\'scope.writePhotosAlbum\']) {
                        wx.showModal({
                          title: \'提示\',
                          content: \'获取权限成功,再次点击图片即可保存\',
                          showCancel: false,
                        })
                      } else {
                        wx.showModal({
                          title: \'提示\',
                          content: \'获取权限失败，将无法保存到相册哦~\',
                          showCancel: false,
                        })
                      }
                    },
                    fail(failData) {
                      console.log("failData", failData)
                    },
                    complete(finishData) {
                      console.log("finishData", finishData)
                    }
                  })
                }
              })
            }
          },
          complete(res) {
            console.log(res);
            wx.hideLoading()
          }
        })


      }  

    })






  },