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jquery常用的选择器
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基础的 id clss 标签选择：$('爱选哪个选哪个').

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.col {
			color: white;
		}
	</style>
</head>
<body>
	<p>Hello world</p>
	<p id="title">Hello</p>
	<p class="text">World</p>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
	// 标签选择
	$('p').css('background-color','red')
	// // id选择
	$('#title').css('backgroundColor','lightgreen')

	// //class选择
	$('.text').addClass('col')

</script>
</html>

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清除样式，$('*').remove+爱删哪个删哪个

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.col {
			color: white;
		}
	</style>
</head>
<body>
	<p>Hello world</p>
	<p id="title">Hello</p>
	<p class="text">World</p>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
	// 标签选择
	$('p').css('background-color','red')
	// // id选择
	$('#title').css('backgroundColor','lightgreen')

	// //3.class选择
	$('.text').addClass('col')
        // 清除语句，$('*').remove+爱删哪个删哪个
        $('*').removeAttr('style')
	$('*').removeClass()
	
</script>
</html>

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过滤器 first和last：第一和最后

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.col {
			color: white;
		}
	</style>
</head>
<body>
	<p>Hello world</p>
	<p id="title">Hello</p>
	<p class="text">World</p>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
	// 标签选择
	$('p').css('background-color','red')
	// // id选择
	$('#title').css('backgroundColor','lightgreen')

	// //3.class选择
	$('.text').addClass('col')
    $('*').removeAttr('style')
	$('*').removeClass()
      //第一和最后
	$('p:first').css('color','skyblue')
	$('p:last').css('color','skyblue')
	
</script>
</html>

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选择为空的元素？？添加内容——无中生有：$(':empty')

取反——无懈可击：$(':not(:empty)')

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.col {
			color: white;
		}
	</style>
</head>
<body>
	<p>Hello world</p>
	<!--只有空的标签元素才能插入 -->
	<p></p>
	<p id="title">Hello</p>
	<p class="text">World</p>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
	// 标签选择

	$('p').css('background-color','red')
	// // id选择
	$('#title').css('backgroundColor','lightgreen')

	// //3.class选择
	$('.text').addClass('col')

	$('p:first').css('color','skyblue')
	$('p:last').css('color','skyblue')
	$('*').removeAttr('style')
	$('*').removeClass()
         
	$(':empty').text('作者:孟浩然')
	$(':not(:empty)').css('color','wheat')
</script>
</html>

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遍历toArray()

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.col {
			color: white;
		}
	</style>
</head>
<body>
	<li>Hello world</li>

	<li id="title">Hello</li>
	<li class="text">World</li>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
	var li = $('li').toArray()
	for(var i=0; i<li.length; i++){
		li[i].style.color = 'green'
	}	
</script>
</html>

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返回元素 first() last() find()

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.col {
			color: white;
		}
	</style>
</head>
<body>
	<ul>
		<li>Hello world</li>
		<li id="title">Hello</li>
		<li class="text">World</li>
	</ul>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
	// $('ul').find('li').css('color','coral')
	
	$('li').first().css('color','red')
	$('li').last().css('color','red')
</script>
</html>

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