Vue.createapp не функция
vue 2 :
<script src="https://unpkg.com/vue"></script>
vue 3 :
<script src="https://unpkg.com/vue@next"></script>
Mohamad
vue 2 :
<script src="https://unpkg.com/vue"></script>
vue 3 :
<script src="https://unpkg.com/vue@next"></script>