版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jit/2.0.2/Extras/excanvas.js
- https://cdn.bootcdn.net/ajax/libs/jit/2.0.2/Extras/excanvas.min.js
- https://cdn.bootcdn.net/ajax/libs/jit/2.0.2/jit.js
- https://cdn.bootcdn.net/ajax/libs/jit/2.0.2/jit.min.js