版本：2.3.6
- https://cdn.bootcdn.net/ajax/libs/jsPlumb/2.3.6/css/jsplumbtoolkit-defaults.css
- https://cdn.bootcdn.net/ajax/libs/jsPlumb/2.3.6/css/jsplumbtoolkit-defaults.min.css
- https://cdn.bootcdn.net/ajax/libs/jsPlumb/2.3.6/js/jsplumb.js
- https://cdn.bootcdn.net/ajax/libs/jsPlumb/2.3.6/js/jsplumb.min.js