vue 和react中子组件分别如何向父组件传值

vue子组件和父组件双向传值：

 

子：

Vue.component("childComponent",{
template:`<div><p @click='postData'>向父组件传值:点击我</p>{{result?'开':'关'}}<p @click='handleData'>子组件改变父组件的数值</p></div>`,
props:{
result:Boolean,
changeData:Function
},
data(){
return{
message:'从子组件传过来的数据'
}
},
methods:{
postData(){
this.$emit('receiveData',this.message)
},
handleData(){
this.changeData()
}

}
});

 

父：

 

const app = new Vue({
el: '#app',
router,
data:{
results:true,//开关状态数据
ChildData:'',
changedatas:'哈哈哈哈'
},
methods:{
change(){
this.results=!this.results;
},
FromChildData(data){
this.ChildData = data
},
handleData(){
this.changedatas +=2
}
},
components: { App },
template: `
<div id="app">
<p>changedatas:{{changedatas}}</p>
<p>接收子组件的数据:{{ChildData}}</p>
<childComponent :result="results"
:change-data="handleData"
@receiveData="FromChildData"></childComponent>
<input type="button" value="change me 开 关" @click="change">
</div>
`
})

 

 

react子组件和父组件双向传值：

父：

import React, { Component } from 'react';
import AppChild from './child.js'
class AppParent extends Component {
constructor(props){
super(props);
this.state = {
parentData: '从父组件过来的数据',
childData:'初始化数据'
};
}
handleChildData = (childData) => {
this.setState({
childData:childData
})
};
render() {
let parentData = this.state.parentData;
let childData = this.state.childData;
return (
<div className="parent">
<p>接收来自子组件传来的数据：{childData}</p>
<AppChild parentData={parentData} onChildDataChange={this.handleChildData}></AppChild>
</div>
);
}
}

export default AppParent;

 

子：

import React, { Component } from 'react';
class AppChild extends Component {
constructor(props){
super(props);
}
handleData = (e) =>{
// 接受父组件传递过来的函数，调用并传值给父组件
this.props.onChildDataChange(e.target.value)
};
render() {
return (
<div className="child">
AppChild
输入传入父组件的数据：<input type="text" value={this.props.childData} onChange={this.handleData}/>
<p>{this.props.parentData}</p>
</div>
);
}
}

export default AppChild;