react-todolist

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.bootcss.com/react/16.4.0/umd/react.development.js"></script>
   <script src="https://cdn.bootcss.com/react-dom/16.4.0/umd/react-dom.development.js"></script>
   <script src="https://cdn.bootcss.com/babel-standalone/6.26.0/babel.min.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app"></div>


    <script type="text/babel">



       class Demo extends React.Component{
           constructor(props){
               super(props)
               this.state={
                    arr:[]
               }
           } 



           tap(){
               var att = this.state.arr;
               att.push(this.refs.zhi.value)
               this.setState({arr:att})
               this.refs.zhi.value=""
              
           }

           del(key){
             var arr1 = this.state.arr;
             arr1.splice(key,1)
             this.setState({arr:arr1})
           }

        



            render(){
                var that = this
                var jsx=[]
                this.state.arr.map(function(item,key){
                    jsx.push(<div>{item}----------<button onClick={that.del.bind(that,key)}>删除</button></div>)          
                })



                
                return(
                    <div>
                        <input type="text" ref="zhi"/>
                         <button onClick={this.tap.bind(this)}>添加</button>
                       
                        <hr/>
                      
                        {jsx}
                        
                    </div>
                )
            }



       }


      


     ReactDOM.render(<Demo/>,document.getElementById("app"))
     
    </script>

</body>
</html>
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