<template lang="html">
    <div>
        <div>{{ count }}</div>
        <button @click="add()">Increment</button>
    </div>
</template>

<script>
export default {
    data () {
        return {
            count: 0
        }
    },
    methods: {
        add () {
            this.count += 1;
        }
    }
}
</script>