DOM 待编辑

<!DOCTYPE html>

<html>

	<head>

		<meta charset="UTF-8">

		<title></title>

	</head>

	<body>

	<div id="title">DOM</div>

	<script>

		document.getElementById("title").classList.add("h5");

		var h1 = document.createElement("h1");

		h1.innerHTML = "hellow";

		h1.className = "h1";

		document.getElementById("title").appendChild(h1);

		if (document.getElementById("title").contains(h1)) {

			alert("yes")

		}

	</script>

	</body>

</html>

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