react组件传值传方法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="../node_modules/react/umd/react.development.js"></script>
    <script src="../node_modules/react-dom/umd/react-dom.development.js"></script>
    <script src="../node_modules/babel-standalone/babel.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
    class Txt extends React.Component{
        constructor(props){
            super(props);
            this.Input = this.Input.bind(this);
        }
        Input(e){
          if(e.keyCode===13){
            this.props.addItem(e.target.value);
            // e.target.value = '';
            // this.refs.wbk.value = '';
            this.jd.value = '';
          }
        }
        render(){
            console.log(this)
            // 官方推荐 将文本框的值挂载到函数实例上储存起来 很react的做法
            return (
                // <input type='text' onKeyUp={this.Input} ref='wbk'/>
                <input type='text' onKeyUp={this.Input} ref={(wb)=>this.jd=wb}/>
            )
        }
    }
    class List extends React.Component{
        constructor(props){
            super(props);
        };
        render(){
            let {data:list} = this.props;
            return(
                // 这里绑定的this没有作用，只是为了返回一个没有立即执行的方法
                <ul>
                    {
                        list.map((item,index)=>{
                        return <li key={index} style={{background:index===1?'red':'skyblue'}}>
                        {item}
                        <button onClick={this.props.remove.bind(this,index)}>del</button>
                        </li>
                        })
                    }
                </ul>
            )
        }
    }
    class App extends React.Component{
        // 进行props的继承
        constructor(props){
            super(props);
            // super继承根数据
            this.state = {
                list:['aa','bb']
            }
            // 绑定了这些方法调用的this
            this.addItem = this.addItem.bind(this);
            this.del = this.del.bind(this);
        };
        addItem(str){
            // 解构赋值 进行修改state状态
            let list1 = [...this.state.list,str];
            this.setState({
                list:list1
            })
        };
        del(idx){
            let list1 = [...this.state.list];
            list1.splice(idx,1);
            this.setState({
                list:list1
            })
        }
        render(){
            // 结构数据
            let {list} = this.state;
            return (
                // 进行传值和传方法
                <div>
                    <Txt addItem={this.addItem}/>
                    <List  data={list} remove={this.del}/>
                </div>
            )
        }
    }
        ReactDOM.render(
            <App/>,
            document.getElementById('app')
        )
    </script>
</body>
</html>
react组件传值传方法

猜你喜欢
