metodosCompo.html

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximun-scale=1, minimun-scale=1">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Métodos en componentes</title>
  </head>
  <body>

    <main id="app">
      <me-gusta></me-gusta>
    </main>

    <template id="meGusta">
      <button @click="incremento">{{total}} Me gusta</button>
    </template>

    <script src="vueJS/vue.min.js"></script>
    <script>
      Vue.component('me-gusta',{
        template: '#meGusta',
        data: function(){
          return{
            total:0
          }
        },
        methods:{
          incremento:function(){
            this.total += 1
          }
        }
      })

      const app = new Vue({
        el:'#app'
      })
    </script>

  </body>
</html>