版本：2.0.3
- https://cdn.bootcdn.net/ajax/libs/konva/2.0.3/konva.js
- https://cdn.bootcdn.net/ajax/libs/konva/2.0.3/konva.min.js
Konva is an HTML5 Canvas JavaScript framework that enables high performance animations, transitions, node nesting, layering, filtering, caching, event handling for desktop and mobile applications, and much more.