<body>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script> --- ➊
<div id="app">{{ message }}</div> --- ➏
<script>
const { createApp } = Vue; -------- ➋
createApp({ ----------------------- ➌
data() { ------------------------ ➍
return { ---------------------- ➍
message: "Hello Vue.js!", --- ➍
}; ---------------------------- ➍
}, ------------------------------ ➍
}).mount("#app"); ----------------- ➎
</script>
</body>