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App.vue
CompOne.vue
main.js
 
<template>
  <h1>The 'activated' and 'deactivated' Lifecycle Hooks</h1>
  <p>In this example for the 'activated' and 'deactivated' hooks we also see when and if the 'mounted' and 'unmounted' hooks are run.</p>
  <button @click="this.activeComp = !this.activeComp">Include component</button>
  <div>
    <KeepAlive>
      <comp-one v-if="activeComp"></comp-one>
    </KeepAlive>
  </div>
</template>

<script>
export default {
  data() {
    return {
      activeComp: false
    }
  }
}
</script>

<style scoped>
  div {
    border: dashed black 1px;
    border-radius: 10px;
    padding: 20px;
    margin-top: 10px;
    background-color: lightgreen;
  }
</style>                  
http://localhost:5173/