麻烦老师看看我的代码是否正确

来源：9-5 编程练习

做厉害的人

2019-07-12 13:34:10

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>节点练习</title>
</head>
<body>
<div id="wrap">
<ul id="list">
<li>第一个li</li>
<li>第二个li</li>
<li>第三个li</li>
</ul>
</div>
<script>
//在此处补充代码
var wrap = document.getElementById("wrap");
var list = document.getElementById("list");
var ul = document.createElement("ul");
var textNodes= ["HTML","CSS","HTML5","CSS3"];
var li = null;

for(var i = 0,len = textNodes.length ; i < len ; i++){
var textNode = document.createTextNode(textNodes[i]);
li = document.createElement("li");
li.appendChild(textNode);
ul.appendChild(li);

}
wrap.replaceChild(ul,list);

</script>
</body>
</html>