props的用处

class Mycomponent extends React.Componet {
    render() {
        const {name, age } = this.props
        return (
            <ul>
                <li>姓名：{name}</li>
                <li>年龄：{ age } </li>
            </ul>
        ) 
    }
}

ReactDom.render(<Mycomponent name="张三" age="18" />, document.getElementById('test'))
// 或者
const p = { name; '张三', age: 18}
ReactDom.render(<Mycomponent { p } />,document.getElementById('test'))


// 重新复制一个对象
let p = {name: '55', age: "12"}
let p2 = {...p}