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玄夜的博客
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1003 people have browsed it
<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<ul>
			<li>列表项01</li>
			<li>列表项02</li>
			<li>列表项03</li>
			<li>列表项04</li>
			<li>列表项05</li>
		</ul>
	</body>
	
	<script>
		//childNodes()  获取到父节点下的所有子节点
		//页面中空白字符也是一个文本节点(例如回车)
		var child = document.childNodes[1].childNodes[2]
		console.log(child)
		
		//children()   只获取元素节点
		var body = document.children[0].children.item(1)
		console.log(body)
		
		//firstElementChild()   第一个子元素
		body.firstElementChild.firstElementChild.style.background = 'pink'
		//lastElementChild()   最后一个子元素
		body.firstElementChild.lastElementChild.style.background = 'yellow'
		
		//childElementCount()  获取子元素的数量
		console.log(body.firstElementChild.childElementCount)
		
		//nextElementSibling()  下一个兄弟元素
		var li = document.getElementsByTagName('li').item(2)
		li.nextElementSibling.style.background = 'red'
		li.previousElementSibling.style.background = 'blue'
		
		//parentElement()  父节点
		li.parentElement.style.background = 'lightblue'
		//parentNode()   父节点
		li.parentNode.parentNode.style.background = 'gray'
	</script>
</html>


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