<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>lesson 41</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="root"></div>
</body>
<script>
// dom ref
// CompositionAPI 的语法下,获取真实的 DOM 元素节点
const app = Vue.createApp({
setup() {
const { ref, onMounted } = Vue;
const hello = ref(null); // 固定语法 ref(null)
onMounted(() => {
console.log(hello.value);
})
return { hello }
},
template: `
<div>
<div ref="hello">hello world</div>
</div>
`,
});
const vm = app.mount('#root');
</script>
</html>