关于react.js:React-setState和hooks

1. 函数组件
const [state, setState] = useState('');
setState本质：dispatchAction -> scheduleUpdateOnFiber

2. class组件
this.setState({}) -> enqueueSetState -> scheduleUpdateOnFiber
setState是Component.prototype上的办法，constructClassInstance -> adoptClassInstance -> instance.update = classComponentUpdater