js动态获取div高度

<input type="button" onclick="getDivHeight()" value="getHeight"/>

function getDivHeight(){
	var popObj = document.createElement("div");
	document.body.appendChild(popObj);
	popObj.innerHTML="<div style='width:200px;height:100px;'>你好啊</div>";
	alert("height:"+popObj.scrollHeight + "\n" + "width:"+popObj.scrollWidth);
}