<!DOCTYPE html>
<html>
<body>
<h1>隐藏 HTML 元素</h1>
<h2 id="01">Hello World!</h2>
<h2 id="02">Hello China!</h2>
<h2 id="03">Hello Shanghai!</h2>
<script>
document.getElementById("02").style.display = "none";
</script>
</body>
</html>