avue.vue

<template>
 <div v-on:click="click">Click Me!</div>
</template>
<script>
export default {
  
  data () {
    return {
      foo: 'bar'
    }
  },
  
  props: {
    clickFn: {
      default: null
    }
  },
  
  methods: {
    click () {
      if (!this.clickFn || !(typeof this.clickFn === 'function')) {
        // default click action
      } else {
        this.clickFn.call(this);
        // or 
        this.clickFn.call(this, 'an argument for clickFn', 'and another');
        // or even just something simple:
        this.clickFn();
      }
    }
  }
};
</script>