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react父组件向子组件传值
* 父组件 TodoList.js import React,{ Component, Fragment } from 'react'//Fragment
作为容器存在,不会渲染成dom元素 import TodoItem from './TodoItem' export default class
TodoList extends Component { constructor(props){ super(props) this.state = {
list:['Vue','Jquery','React'] } } render(){ return ( <Fragment> <p>前端知识点</p> <ul
> { this.state.list.map((item, index)=>{ return ( <li key={index}> <TodoItem
index={index} content={item} ></TodoItem> </li> ) }) } </ul> </Fragment> ) } }
* 子组件 TodoItem.js import React,{ Component } from 'react' export default class
TodoItem extends Component { handClick() { console.log(this.props.index) }
render(){ return ( <div onClick={this.handClick.bind(this)}>{this.props.content}
</div> ) } }
