<template>
  <div>
    <button @click="fetchData">Fetch Data</button>
    <p v-if="data">{{ data }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: null,
    };
  },
  methods: {
    fetchData() {
      const response = fetch("file.txt");
      this.data = response;
    }
  }
};
</script>                  

Hello World!                  

import { createApp } from 'vue'

import App from './App.vue'

const app = createApp(App)
app.mount('#app')