### Version of js-screen-shot 1.9.9-rc.23 ### Operating system and its version Windows ### Browser and its version _No response_ ### Sandbox to reproduce _No response_ ### What happened?  如何在点击了自定义工具栏的图标,获取到当前截图(包括标注)的图片信息(base64)? ### 报错信息 _No response_