[JavaScript知识库]react 实例（输入框点击添加删除项）

App.js? 👇?

import React,{Component} from 'react';

class App extends React.Component{
  constructor(props){
    super(props)
      this.state={
        inputValue:'',
        list:['辣条','鸡翅']
      }
    }

  inputChange=(e)=>{
    this.setState({
      inputValue: e.target.value
    })
  }

  //增加列表项
  addList=()=>{
    this.setState({
      list:[...this.state.list,this.state.inputValue],
      inputValue:''
    })
  }

  //删除列表项
  deleteItem(index){
    let list = this.state.list
    list.splice(index,1)
    this.setState({
      list:list
    })
  }

  render(){
    return (
      <div>
      <div><input value={this.state.inputValue} onChange={this.inputChange}/>
      <button onClick={this.addList}>点击</button>
      </div>
      <ul>{       
        this.state.list.map((item,index)=>{
          return (<li key={index+item} onClick={this.deleteItem.bind(this,index)}>{item}</li>)
        })
      }
      </ul>
    </div>
    )
  }
}


export default App;

index.js 👇

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(<App/>,document.getElementById('root'));

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?点击后 👆