版本：4.1.1
- https://cdn.bootcdn.net/ajax/libs/konva/4.1.1/konva.js
- https://cdn.bootcdn.net/ajax/libs/konva/4.1.1/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.