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常用css选择器和优先级练习----2019年1月14日23时30分
aptx_1999的博客
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熟练使用css进行网页美化,能给页面带来丰富的内容和色彩

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>常用选择器与优先级(seceltor)</title>
	<style>
		/*标签选择器*/
		h3 {
			background-color:lightgreen;
			color:red;
		}
		/*class选择器*/
		.bg-blue{
			background-color: skyblue;
		}
		/*id选择器*/
		#bg-yellow{
			background-color: yellow;
		}

	</style>
</head>
<body>
	<h3 class="bg-blue">样式规则 = 选择器 + 样式声明</h3>
	<h3 class="bg-blue" id="bg-yellow" style="background-color:pink">样式规则 = 选择器 + 样式声明</h3>
	<!--选择器优先级顺序 标签 < class < id-->
	<!--用js实现更改h3标签背景色-->
	<script type="text/javascript">
	document.getElementById('bg-yellow').style.backgroundColor = 'lightgrey';

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

运行实例 »

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以上代码涉及知识点总结:

一.常用css选择器有标签选择器、类class选择器、id选择器,类选择器用 . 引用,id选择器用 # 引用

二.优先级顺序是 标签 < class < id

三.比id选择器更高级的可以用js,如document.getElementById('id选择器名字').style.backgroundColor='颜色',更改id属性的元素的背景色。

Correction status:Uncorrected

Teacher's comments:
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