浅析TypeScript和React中使用ref的方法(2)-木庄网络博客

1、constructor中onRef绑定this

1	`this.props.onRef(this)Copy to clipboardErrorCopied`

完成以上4步骤，父组件中可以随便调用子组件中state的值以及方法。

export class ParentCom extends React.Component<{}, {}> {
    constructor(props:{}){
        super(props);
        this.onRef = this.onRef.bind(this);
    }
    public child: any;
 
    onRef(ref:any){
        this.child = ref;
    }
 
    getChildFun(){
        this.child.testFun();
    }
 
    render(){
        return (
           <div>
               <span>父组件</span>
               <ChildCom onRef={this.onRef}></ChildCom>
           </div>
        )
    }
}
interface childProps{
    onRef? : any
}
export class ChildCom extends React.Component<childProps, {}> {
    constructor(props:{}){
        super(props);
        this.props.onRef(this);
    }
 
 
    testFun(){
        console.log(123)
    }
 
    render(){
        return (
           <div>
               <span>子组件</span>
           </div>
        )
    }
}