vue 3 use methods from setup code example

Example: vue methods

<template>
  <div id="example">
    <button v-on:click="greet">Greet</button>
  </div>
</template>

<script>
export default {
  methods: {
    greet: function(event) {
      // `event` is the native DOM event
      alert(event.target.tagName);
    }
  }
};
</script>