<div id="app">
<div ref="box1"></div>
</div>const { createApp, onMounted, ref } = Vue;
const app = createApp({
setup() {
const box1 = ref(null);
onMounted(() => {
console.log('DOM Box1：', box1.value);
})
return {
box1,
}
}
});
app.mount('#app');
External CSS
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