react-event-pooling
事件池
https://codesandbox.io/s/3xp4y9zp7q
https://reactjs.org/docs/events.html#event-pooling
https://reactjs.org/docs/glossary.html#controlled-vs-uncontrolled-components
https://reactjs.org/docs/handling-events.html#___gatsby
https://reactjs.org/docs/react-without-es6.html#autobinding
event bus / event emitter
https://repl.it/languages/javascript
https://repl.it/@xgqfrms/Event-Bus
https://repl.it/@xgqfrms/EventEmitter-class