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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div></div>
<ul id="uls">
<li>1</li>
<li>2</li>
<!-- 今天天气挺好的！！！ -->
<li id="demo">3</li>
<li>4</li>
<li>5</li>
</ul>
</body>
<script>
//alert(document.documentElement.nodeName);
//alert(document.body.nodeName);
//测试元素节点
var uls = document.getElementById('uls');
//alert(uls.nodeName);
//alert(uls.firstChild.nodeName);
//alert(uls.lastChild.nodeName);
//console.log(uls.childNodes);
console.log(uls.children[0]);
</script>
</html>点击 "运行实例" 按钮查看在线实例
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