jQuery.获取过滤点
获取过滤点
| 方法 | 说明 |
| first() | 获取第一个，示例 $('li').first() |
| last() | 获取最后一个，示例$('li').last() |
| eq() | 获取指定索引的节点，索引从0开始，示例$('li').eq(1)，获取第二个li |
| not() | 不包含某些，示例$('li').not("#d") |
| filter() | 包含某些， 示例$("li").filter("#d")，未包含的未选取 |
<!DOCTYPE html>
<html>
<head>
<title>过滤节点</title>
<meta charset="UTF-8">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"></script>
<style>
.box{
border: 1px solid black;
padding: 1px;
margin-bottom: 12px;
}
</style>
</head>
<body>
<div>
<ul id="ul">
<li id="a">油条</li>
<li id="b">包子</li>
<li id="c">米饺</li>
<li id="d"><a>鱼粉</a></li>
</ul>
</div>
<script>
$('li').first("#d").attr("class","box");
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>过滤节点</title>
<meta charset="UTF-8">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"></script>
<style>
.box{
border: 1px solid black;
padding: 1px;
margin-bottom: 12px;
}
</style>
</head>
<body>
<div>
<ul id="ul">
<li id="a">油条</li>
<li id="b">包子</li>
<li id="c">米饺</li>
<li id="d"><a>鱼粉</a></li>
</ul>
</div>
<script>
$('li').last("#d").attr("class", "box");
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>过滤节点</title>
<meta charset="UTF-8">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"></script>
<style>
.box{
border: 1px solid black;
padding: 1px;
margin-bottom: 12px;
}
</style>
</head>
<body>
<div>
<ul id="ul">
<li id="a">油条</li>
<li id="b">包子</li>
<li id="c">米饺</li>
<li id="d"><a>鱼粉</a></li>
</ul>
</div>
<script>
$('li').eq("#d").attr("class", "box");
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>过滤节点</title>
<meta charset="UTF-8">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"></script>
<style>
.box{
border: 1px solid black;
padding: 1px;
margin-bottom: 12px;
}
</style>
</head>
<body>
<div>
<ul id="ul">
<li id="a">油条</li>
<li id="b">包子</li>
<li id="c">米饺</li>
<li id="d"><a>鱼粉</a></li>
</ul>
</div>
<script>
$('li').not("#d").attr("class", "box");
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>过滤节点</title>
<meta charset="UTF-8">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-3.3.1.min.js"></script>
<style>
.box{
border: 1px solid black;
padding: 1px;
margin-bottom: 12px;
}
</style>
</head>
<body>
<div>
<ul id="ul">
<li id="a">油条</li>
<li id="b">包子</li>
<li id="c">米饺</li>
<li id="d"><a>鱼粉</a></li>
</ul>
</div>
<script>
$('li'). filter("#d").attr("class", "box");
</script>
</body>
</html>
