1.父子组件方法调用
// 父组件
import React, {Component} from 'react';
class Parents extends Component {
constructor(props) {
super(props);
this.state = {
}
}
componentDidMount() {
}
handleCancel = (e) => {
console.log('父组件的方法被子组件调用');
}
childClick = (e) => {
this.child.onShow()
}
render() {
return (
<section>
<Child onCancel={this.handleCancel} onRef={(ref)=>{ this.child = ref}}></Child>
<div onClick={this.childClick}>调用子组件的函数</div>
</section>
);
}
}
export default Parents;
// 子组件
import React, {Component} from 'react';
class Child extends Component {
constructor(props) {
super(props);
this.state = {
}
}
componentDidMount() {
this.props.onRef(this)
}
onShow(){
console.log('子组件的方法被父组件调用')
}
render() {
return (
<section>
<div onClick={()=>{this.props.handleCancel()}}>子组件用this.props调用父组件的函数</div>
</section>
);
}
}
export default Child;
2.父子组件之间传值
transMsg(types){
var newOrders=[];
for(let type of types){
if(type)
alert(type);
}}
<Child parm={ this.state.msg} transMsg={ msg => this.transMsg(msg) } />
父组件向子组件传值：
this.props.parm;
子组件向父组件传值：子组件通过调用父组件传递到子组件的方法 向父组件传递消息的
this.props.transMsg("hi ~~");
