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React.js parent-child component data binding real-time communication example display
React.js parent-child component data binding real-time communication example display
This article mainly introduces the sample code of react.js parent-child component data binding real-time communication.
I am still exploring and learning react.js myself, and encountered the problem of parent-child component data binding real-time communication. I studied the problem, shared it with everyone, and left a note for myself:
import React,{Component} from 'react'
import ReactDOM from 'react-dom'
class ChildCounter extends Component{
render(){
return(
<p style={{border:'1px solid red'}}>
{this.props.count}
</p>
)
}
}
/*
* 大家默认规定的一些步骤，方便大家看
* 1.默认值
* 2.初始化状态
* 3.钩子函数
* 4.方法函数
* */
class Counter extends Component{
//默认属性对象
static defaultProps={
number:5
}
constructor(props){
super(props);
//获取我的初始状态
this.state={
number:props.number
}
}
//钩子函数
componentWillMount(){
console.log('组件将要挂载')
}
componentDidMount(){
console.log("组件挂载完成")
}
handleClick=()=>{
//this.setState方法是异步的，一个函数里面只能调用一次this.setState方法
//调用多次会合并，只执行一次
this.setState((prev,next)=>({
//上一次的状态prev
number:prev.number+1
}),()=>{
console.log("回调函数执行")
})
// this.setState({index:this.state.index+1})
}
render(){
//调用子组件ChildCounter，把当前状态值传过去
return(
<p>
<p>{this.state.number}</p>
<button onClick={this.handleClick}>+</button>
<ChildCounter count={this.state.number}></ChildCounter>
</p>
)
}
}
//渲染到页面
ReactDOM.render(<Counter></Counter>,document.querySelector("#root")The above is the detailed content of React.js parent-child component data binding real-time communication example display. For more information, please follow other related articles on the PHP Chinese website!
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