VueToDoList.html

<!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="./vue.js"></script>
    <title>Document</title>
</head>

<body>
    
    <div id="app">
        <input type="text" v-model="inputValue" />
        <button v-on:click="handleBtnClick" >提交</button>
        <ul>
            <li v-for="item in list">{{item}}</li>       
        </ul>
    </div>

    <script>
        var arr = ['1','2','3'];
         var app = new Vue({
            el: "#app",
            data: {
                list: [],
                inputValue: ''
            },
            methods:{
                handleBtnClick: function(){
                    this.list.push(this.inputValue);
                    this.inputValue ==''
                }
            }
        })
  
    </script>
</body>

</html>