这段代码里的这句话是干嘛用的？ newnode.appendChild(newnodeText);
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
function replaceMessage(){
var newnode = document.createElement("p");
var newnodeText = document.createTextNode("javascript");
newnode.appendChild(newnodeText);
var oldNode = document.getElementById("oldnode");
oldNode.parentNode.replaceChild(newnode,oldNode);
}
</script>
<h1 id="oldnode">Java</h1>
<a href="javascript:replaceMessage()">"Java"替换"Javascript"</a>
</body>
</html>
