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标题

import React, {
    Component } from 'react'export default class App extends Component {
       state = {
           datalist:["aaa","bbb","ccc","ddddd"]    }    mytext = React.createRef()     render() {
           // console.log(this)        return (            
   
                
                    
    add2                                    
    
                         {
                           this.state.datalist.map((item,index)=>                        
     
                            {
   item}                            this.handleDel(index)}>del1                            del2                        
                        )                    }                
    
            
   
        )    }    handleClickAdd() {
           console.log("click", this.mytext.current.value)        // this.state.datalist.push(this.mytext.current.value)        // this.forceUpdate()        this.setState({
               datalist:[...this.state.datalist,this.mytext.current.value]        })        this.mytext.current.value = "" //ref 引用清空     }    handleDel(index){
           // this.state.datalist.splice        console.log("del",index)        // this.state.datalist.splice(index,1)        var newlist = [...this.state.datalist]        newlist.splice(index,1)        this.setState({
               datalist:newlist        })    }}var list= ["aaa","bbb","ccc"]var newlist = list.map(item=>`
${
     item}
`)console.log(newlist.join(""))//r-if?----------//r-show?---------

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