jQuery常用的选择器函数 2018-4-3 - jquery

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实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>选择器</title>
	<style type="text/css">
		table,td {
			border:1px solid #333;
		}
		table {
			border-collapse:collapse;
			margin:30px auto;
			width:80%;
			text-align:center;

		}
		table caption {
			font-size: 1.5em;
			margin-bottom:50px;
		}

		.bg-orange {
			font-weight:bolder;
			color:white;
			background-color:orange;
		}
	</style>
</head>
<body>
	<table>
		<caption>用户信息表格</caption>
		<tr id="title">
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
		</tr>
		<tr>
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
		</tr>
		<tr>
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
		</tr>
		<tr>
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
		</tr>
		<tr class="mark">
			<td>01</td>
			<td>02</td>
			<td>03</td>
			<td>04</td>
			<td>05</td>
		</tr>
	</table>
</body>
</html>

<script type="text/javascript" src ="../js/jquery-3.3.1.js"></script>

<script type="text/javascript">
	//tag标签选择器
	// $('td').css('backgroundColor','wheat')


	//id选择器
	$('#title').css('backgroundColor','green')

	// class选择器:
	$('.mark').addClass('bg-orange')

	//通配符选择器
	$('tr:nth-child(2) ~*').css('backgroundColor','pink')
</script>

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其中的3个层级选择器:

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>层级选择器</title>
	<style type="text/css">
		.green{
			color:green;
		}

		.red{
			color:red;
		}
	</style>
</head>
<body>
	<ul>
		<li>流行歌曲01<a href="">立即播放</a></li>
		<li>流行歌曲02<a href="">立即播放</a></li>
		<li>流行歌曲03<a href="">立即播放</a></li>
		<li>流行歌曲04<a href="">立即播放</a></li>
		<li>流行歌曲05<a href="">立即播放</a></li>
		<li>流行歌曲06<a href="">立即播放</a></li>
		<li>流行歌曲07<a href="">立即播放</a></li>
		<li>流行歌曲08<a href="">立即播放</a></li>
		<li>流行歌曲09<a href="">立即播放</a></li>
		<li>流行歌曲10<a href="">立即播放</a></li>
	</ul>
</body>
</html>

<script type="text/javascript" src ="../js/jquery-3.3.1.js"></script>
<script type="text/javascript">
	//后代选择器:空格
	$('li a').addClass('green')

	//所有子元素选择器
	//孙子元素<a>文本不会发生变化

	//$('ul > *').addClass('red')

	//相邻兄弟选择器+  将第5个li的下一个兄弟:第6个li前景色变更为绿色
	// $('li:nth-child(5)+li').addClass('red')
	////4. 全部兄弟元素 ~
	$('li:nth-child(5) ~li').addClass('green')


</script>

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