the project structure is shown in figure

:

HellowWorld.vue

<template>
  <div class="hello">
    124
    <router-view></router-view>
  </div>
</template>

global.vue

<template>
  <div class="page">
      <h1>vueapi</h1>
  </div>
</template>

but the page is only 124 with no H1 tag