小程序申请权限保存图片到相册

wx.saveImageToPhotosAlbum({
      filePath: path,
      success: (res) => {
        wx.showToast({
          title: '保存成功，请到相册查看',
          icon: 'none'
        })
      },
      fail: (res) => {
        wx.getSetting({
          success: res => {
            let authSetting = res.authSetting
            if (!authSetting['scope.writePhotosAlbum']) {
              wx.showToast({
                title: '授权失败',
                icon: 'error'
              })
            } else {
              wx.showToast({
                title: '保存失败',
                icon: 'error'
              })
            }
          }
        })
      }
    })