版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/event-drops/1.3.0/index.js
- https://cdn.bootcdn.net/ajax/libs/event-drops/1.3.0/index.js.map
- https://cdn.bootcdn.net/ajax/libs/event-drops/1.3.0/style.css
A time based / event series interactive visualization using d3.js. Use drag and zoom to navigate in time.