react双组件传值和传参

<!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 src="./db.js"></script>
    <script type="text/babel">
    class Item extends React.Component{
        constructor(props){
            super(props);
        };
        render(){
            let {it}=this.props;
            return(
            <div>
                {it.map((item,index)=>{//遍历拿到key值
                    return <div key={item.id}>
                            {Object.keys(item)}: //拿到数组
                            {Object.keys(item).map((v,ind)=>{
                                return <div key={ind}> 
                                         {item[v]} //遍历进行解析内置的json内容
                                        </div>
                            })}  
                        </div>
                })}
            </div>
            )
        }
    }
    class List extends React.Component{
        constructor(props){
            super(props);
        };
       render(){
         let {users,companies} = this.props;
         let arr =  Object.keys(this.props); //拿到json的key值数组
         return (
           <div>
                { Object.keys(this.props)} //遍历传过来的json数据
                {arr.map((item,ind)=>{   //遍历进行解析 拿到数组
                    return <Item key={ind} it={this.props[item]}/>
                })}
            </div>
         )
       }
    }
    class App extends React.Component{
        constructor(props){
            super(props);
            this.state = {
                data
            }
       };
        render(){
            return (
            <div>
              <List users={data.users}/> //将数组分组传过去
              <List companies={data.companies}/>
            </div>
            )
        }
    }
        ReactDOM.render(
            <App/>,
            document.getElementById('app')
        )
    </script>
</body>
</html>
react双组件传值和传参

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