<div id="app">
  <p>Count: {{ count }}</p>
  <button @click="increment">Increment</button>
</div>

<script>
const app = Vue.createApp({
  data() {
    return { count: 0 }
  },
  methods: {
    increment() {
      this.count += 1
    }
  }
})
app.mount('#app')
</script>