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                <div id="app">
<input type="text" v-model="inputText">
<button type="submit" v-on:click="save">保存</button>
    <!--   v-for は現在のアイテムに対する配列のインデックスを、任意の2つ目の引数としてサポートしています。   -->
    <li v-for="(todo, index) in todos">{{ todo.text }} <button type="submit" v-on:click="remove(index)">削除</button></li>




                new Vue({
  el: '#app',
  data: {
    inputText: 'text',
    todos: [
      {text: '起きる'},
      {text: 'ご飯を食べる'},
      {text: '寝る'}
  methods: {
    save: function(){
      this.todos.push({text: this.inputText}); 
    remove: function(index){
        // todos配列からindex番目を1取り除く
        this.todos.splice(index, 1);