React-使用循环并实现删除和修改

app.js 

import React, {Component} from 'react';
import logo from './logo.svg';
import './App.css';
import {Person,Twoway} from './Person/Person'

class  App extends Component{
  state={
    persons:[{name:'小仙女',age:'18'},{name:'小玉',age:'18'},{name:'家璇',age:'18'},{name:'小仙女',age:'18'},{name:'小玉',age:'18'},{name:'家璇',age:'18'}],
    name:'',
    age:''

  }

  delete=(index)=>{
    console.log(index)
    let persons=this.state.persons
    //const persons=[...this.state.persons]
    persons.splice(index,1)   //splice改变的是自身数组的长度，如果用变量接收则是删除项的值   
    this.setState({
      persons:persons
    })
  }

  getname=(event)=>{
    console.log(event.target.value);  //获取子组件input的值
    this.setState({
      name:event.target.value
    })
    
  }
  getage=(event)=>{
    console.log(event.target.value);  //获取子组件input的值
    this.setState({
      age:event.target.value
    })
  }

  add=()=>{
    console.log(this.state.name)
    console.log(this.state.age)
    let persons=this.state.persons
    // const persons=[...this.state.persons]
    persons.push({name:this.state.name,age:this.state.age}) 
    this.setState({
      persons:persons,
      name:'',
      age:''
    })


  }

  render(){
    // 遍历数据
    const listItems = this.state.persons.map((item,index) =>
         
     );
      return(
        

             {listItems}
             

             
             
             添加
        
      )      
  } 
}



export default App;

person.js

import React from 'react';


const Person=(props)=>{
    return(
        

            

             我是{props.name},今年{props.age}岁
            
            删除     
        

    )
}



const Twoway=(props)=>{
    return(
        

           
数据双向绑定
           
        
    )
}
// export default Twoway
export 
    {
    Person,
    Twoway 
    }