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                <script src="[email protected]"></script>
<div id="app">
      <!-- click=""の中はJavaScriptを書けるので{{}}は不要 -->
      <p>{{ title }} - {{author}} - 年齢:{{ age }}</p>
      <button v-on:click="age++">Increase age</button>
      <button v-on:click="age--">Decrease age</button>
      <div @click="changeTitle('ここに著者名')">Change book title</div>




const app = Vue.createApp({
  // data, functions
  data() {
    return {
      title: "タイトル",
      author: "著者名",
      age: 32,
  methods: {
    // 単純なクリックイベントの関数
    changeTitle(title) {
      this.title = title;

// mountで指定した範囲内でしかvueは動かない