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App.vue
CompOne.vue
CompTwo.vue
main.js
 
<template>
  <h1>Dynamic Components</h1>
  <p>Refresh the page and there is a chance the dynamic component will toggle.</p>
  <component :is="Math.random() > 0.5 ? 'comp-one' : 'comp-two'"></component>
</template>

<style>
  #app {
    width: 350px;
    margin: 10px;
  }
  #app > div {
    border: solid black 2px;
    padding: 10px;
    margin-top: 10px;
  }
</style>                  
<template>
    <div>
        <h2>One!</h2>
        <p>This is component one.</p>
    </div>
</template>

<script></script>

<style scoped>
    div {
        background-color: lightgreen;
    }
</style>                  
<template>
    <div>
        <h2>Two!</h2>
        <p>This is component two.</p>
    </div>
</template>

<script></script>

<style scoped>
    div {
        background-color: lightpink;
    }
</style>                  
import { createApp } from 'vue'

import App from './App.vue'
import CompOne from './components/CompOne.vue'
import CompTwo from './components/CompTwo.vue'

const app = createApp(App)
app.component('comp-one', CompOne)
app.component('comp-two', CompTwo)
app.mount('#app')
                  
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