版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jquery-watch/1.21.0/jquery-watch.js
- https://cdn.bootcdn.net/ajax/libs/jquery-watch/1.21.0/jquery-watch.min.js
This small jQuery plug-in allows you to monitor changes to any DOM element's CSS styles, attributes or properties and fires a callback in response to any change in the monitored styles or attributes.