1 <div id="event-with-method">
 2     <!-- 此处必须使用greet或者greet($event) -->
 3     <button v-on:click="greet">Greet</button>
 4 </div>
 5 
 6 <script>
 7 Vue.createApp({
 8   data() {
 9     return {
10       name: ‘Vue.js‘
11     }
12   },
13   methods: {
14     greet(event) {
15       // `methods` 内部的 `this` 指向当前活动实例
16       alert(‘Hello ‘ + this.name + ‘!‘)
17       // `event` 是原生 DOM event
18       if (event) {
19         alert(event.target.tagName)
20       }
21     }
22   }
23 }).mount(‘#event-with-method‘)
24 </script>