events.html

<!DOCTYPE html>
<html lang="pt-BR">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Eventos</title>
  </head>
  <body>
    
    <div id="events">
      
     <button v-on:click="alert">Clique aqui</button>

     <hr>

     <button v-on:dblclick="add">Hcode Treinamentos</button>

     <h4>Você clicou na Hcode {{ counter }} vezes</h4>
     
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

    <script>

      let app = new Vue({
        el: '#events',
        data: {
          counter: 0
        },
        methods: {
          add() {
            this.counter+=2;
          },
          alert() {
            alert('Hello World');
          }
        }
      })

    </script>

  </body>
</html>