ভিইউই watch

<!DOCTYPE html>
<html>
<body>

<div id="app">
  <input v-model="name" placeholder="আপনার নাম">
  <p>{{message}}</p>
</div>

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
const {createApp, ref, watch} = Vue;
createApp({
  setup() {
    const name = ref("");
    const message = ref("");
    watch(name, (newName) => {
      message.value = "হ্যালো " + newName;
    });
    return {name, message};
  }
}).mount("#app");
</script>
</body>
</html>