目录 基础选择器 All Selector (*) Class Selector (.class) Element Selector (element) ID Selector (#id) Child Selector (parent child) 属性选择器 Attribute Selector [name=value] Attribute Selector [name|=value] Attribute [name*=val
目录
- 基础选择器
- All Selector ("*")
- Class Selector (".class")
- Element Selector ("element")
- ID Selector ("#id")
- Child Selector ("parent > child")
- 属性选择器
- Attribute Selector [name="value"]
- Attribute Selector [name|="value"]
- Attribute [name*="value"]
- Attribute Selector [name~="value"]
- Attribute Selector [name$="value"]
- Attribute Selector [name^="value"]
基础选择器
All Selector ("*")
选择所有元素,此选择器使用要慎重，其速度是极其慢的
<!DOCTYPE html>
<html>
<head>
<style>
h3 { margin: 0; }
div,span,p {
width: 80px;
height: 40px;
float:left;
padding: 10px;
margin: 10px;
background-color: #EEEEEE;
}
#test {
width: auto; height: auto; background-color: transparent;
}
</style>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<div id="test">
<div>DIV</div>
<span>SPAN</span>
<p>P <button>Button</button></p>
</div>
<script>
var elementCount = $("#test").find("*").css("border","3px solid red").length;
$("body").prepend("<h3>" + elementCount + " elements found</h3>");</script>
</body>
</html>
Class Selector (".class")
选择给定样式类名的所有元素。
<!DOCTYPE html>
<html>
<head>
<style>
div,span {
width: 100px;
height: 40px;
float:left;
padding: 10px;
margin: 10px;
background-color: #EEEEEE;
}
</style>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<div class="notMe">div class="notMe"</div>
<div class="myClass">div class="myClass"</div>
<span class="myClass">span class="myClass"</span>
<script>$(".myClass").css("border","3px solid red");</script>
</body>
</html>
Element Selector ("element")
根据给定（html）标记名称选择所有的元素。
<!DOCTYPE html>
<html>
<head>
<style>
div,span {
width: 60px;
height: 60px;
float:left;
padding: 10px;
margin: 10px;
background-color: #EEEEEE;
}
</style>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<div>DIV1</div>
<div>DIV2</div>
<span>SPAN</span>
<script>$("div").css("border","9px solid red");</script>
</body>
</html>
ID Selector ("#id")
选择一个具有给定id属性的单个元素。
<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 90px;
height: 90px;
float:left;
padding: 5px;
margin: 5px;
background-color: #EEEEEE;
}
</style>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<div id="notMe"><p>id="notMe"</p></div>
<div id="myDiv">id="myDiv"</div>
<script>$("#myDiv").css("border","3px solid red");</script>
</body>
</html>
Child Selector ("parent > child")
选择所有指定“parent”元素中指定的"child"的直接子元素。
<!DOCTYPE html>
<html>
<head>
<style>
body { font-size:14px; }
</style>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<ul class="topnav">
<li>Item 1</li>
<li>Item 2
<ul><li>Nested item 1</li><li>Nested item 2</li><li>Nested item 3</li></ul>
</li>
<li>Item 3</li>
</ul>
<script>$("ul.topnav > li").css("border", "3px double red");</script>
</body>
</html>
属性选择器
Attribute Selector [name="value"]
选择指定属性是给定值的元素。
- attribute: 一个属性名.
- value: 一个属性值，可以是一个不带引号的一个单词或带一个引号的字符串。
<!DOCTYPE html>
<html>
<head>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<div>
<label>
<input type="radio" name="newsletter" value="name" />
<span>name</span>
</label>
</div>
<div>
<label>
<input type="radio" name="newsletter" value="age" />
<span>age</span>
</label>
</div>
<div>
<label>
<input type="radio" name="newsletter" value="age" />
<span>sex</span>
</label>
</div>
<script>$('input[value="name"]').next().text("username");</script>
</body>
</html>
Attribute Selector [name|="value"]
选择指定属性值等于给定字符串或以该字符串为前缀（该字符串后跟一个连字符“-” ）的元素。
<!DOCTYPE html>
<html>
<head>
<style>
a { display: inline-block; }
</style>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<a href="example.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" hreflang="en">Some text</a>
<a href="example.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" hreflang="en-UK">Some other text</a>
<a href="example.html" rel="external nofollow" rel="external nofollow" rel="external nofollow" hreflang="english">will not be outlined</a>
<script>
$('a[hreflang|="en"]').css('border','3px dotted green');
</script>
</body>
</html>
Attribute [name*="value"]
选择指定属性具有包含一个给定的子字符串的元素。（选择给定的属性是以包含某些值的元素）
<!DOCTYPE html>
<html>
<head>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<input name="man-news" />
<input name="milkman" />
<input name="letterman2" />
<input name="newmilk" />
<script>$('input[name*="man"]').val('has man in it!');</script>
</body>
</html>
Attribute Selector [name~="value"]
选择指定属性用空格分隔的值中包含一个给定值的元素。
<!DOCTYPE html>
<html>
<head>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<input name="man-news" />
<input name="milk man" />
<input name="letterman2" />
<input name="newmilk" />
<script>$('input[name~="man"]').val('mr. man is in it!');</script>
</body>
</html>
Attribute Selector [name$="value"]
选择指定属性是以给定值结尾的元素。这个比较是区分大小写的。
<!DOCTYPE html>
<html>
<head>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<input name="newsletter" />
<input name="milkman" />
<input name="jobletter" />
<script>$('input[name$="letter"]').val('a letter');</script>
</body>
</html>
Attribute Selector [name^="value"]
选择指定属性是以给定字符串开始的元素
<!DOCTYPE html>
<html>
<head>
<script src="./jquery-3.6.0.min.js"></script>
</head>
<body>
<input name="newsletter" />
<input name="milkman" />
<input name="newsboy" />
<script>$('input[name^="news"]').val('news here!');</script>
</body>
</html>
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