React 避免 setState 的合并调用特性
index.js
import React from 'react'
import ReactDOM from 'react-dom'
class ANumber extends React.Component {
constructor() {
super()
this.state = {
num: 0,
}
}
componentDidMount() {
this.setState(state => ({ num: state.num + 1 }))
this.setState(state => ({ num: state.num + 1 }))
this.setState(state => ({ num: state.num + 1 }))
this.setState(state => ({ num: state.num + 1 }))
this.setState(state => ({ num: state.num + 1 }))
this.setState(state => ({ num: state.num + 1 }))
// 展示 6,避免了 setState 合并调用特性
}
render() {
return <h1>{this.state.num}</h1>
}
}
ReactDOM.render(<ANumber />, document.getElementById('root'))