版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jquery.hotkeys/0.2.0/jquery.hotkeys.js
- https://cdn.bootcdn.net/ajax/libs/jquery.hotkeys/0.2.0/jquery.hotkeys.min.js
**jQuery Hotkeys** is a plug-in that lets you easily add and remove handlers for keyboard events anywhere in your code supporting almost any key combination.