10_vuex.html

<!DOCTYPE html>
<html lang="pt-br">
<head>
  <meta charset="utf-8">
  <title>Meu primeiro aplicativo Vue</title>
  <script src="https://unpkg.com/vue"></script>
  <script src="https://unpkg.com/vuex"></script>
</head>
<body>
  <div id="app">
    <button @click="aumenta()">{{count}}</button>
  </div>

  <script src="./store.js"></script>
  <script>
    var app = new Vue({
      el: '#app',
      data: {
        message: 'Olá Vue!'
      },
      computed: {
        count: function(){
          return this.$store.state.count;
        }
      },
      methods: {
        aumenta: function(){
          this.$store.commit('increment');
        }
      },
      store: window.STORE,
    })
  </script>
</body>
</html>