6. 常用方法
● addClass()
为jQuery对象添加一个或多个class
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.d1{
width: 200px;
height: 200px;
background-color: gray
}
.d2{
background-color: yellow;
}
.d3{
border: 1px solid red;
}
.d4{
border-radius: 50px;
}
</style>
</head>
<body>
<button id="btn">按钮</button>
<div class="d1" id="d"></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
//为box1添加class,addClass()可以添加一个或多个class
$("#d").addClass(["d2","d3"]);
$("#d").addClass("d4");
});
</script>
</html>
● hasClass()
检查jQuery对象是否含有某个class
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.d1{
width: 200px;
height: 200px;
background-color: gray
}
.d2{
background-color: yellow;
}
.d3{
border: 1px solid red;
}
.d4{
border-radius: 50px;
}
</style>
</head>
<body>
<button id="btn">按钮</button>
<div class="d1 d2 d3 d4" id="d"></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
//hasClass() 检查jQuery对象是否含有某个class
var flag = $("#d").hasClass("d1");
alert(flag);
});
</script>
</html>
● removeClass()
删除jQuery对象的指定class
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.d1{
width: 200px;
height: 200px;
background-color: gray
}
.d2{
background-color: yellow;
}
.d3{
border: 1px solid red;
}
.d4{
border-radius: 50px;
}
</style>
</head>
<body>
<button id="btn">按钮</button>
<div class="d1 d2 d3 d4" id="d"></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
//removeClass()删除jQuery对象的指定class
var flag = $("#d").removeClass("d4");
});
</script>
</html>
● toggleClass()
切换jQuery对象的指定class
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.d1{
width: 200px;
height: 200px;
background-color: gray
}
.d2{
background-color: yellow;
}
.d3{
background-color: rebeccapurple;
}
.d4{
border-radius: 50px;
}
</style>
</head>
<body>
<button id="btn">按钮</button>
<div class="d1 d2 d3 d4" id="d"></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
//toggleClass() 切换jQuery对象的指定class
var flag = $("#d").toggleClass(["d3","d4"]);
});
</script>
</html>
● clone()
复制jQuery元素,当参数为true,元素上的事件也会被复制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
var $l1 = $("#l1").clone();
$("#list1").append($l1);
});
</script>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//复制jQuery元素,当参数为true,元素上的事件也会被复制
var $l1 = $("#l1").clone(true);
$("#list1").append($l1);
});
</script>
</html>
● unwrap()
去除父元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
div{
width: 300px;
height: 300px;
background-color: greenyellow;
}
</style>
</head>
<body>
<button id="btn">去除</button>
<div>
<ul id="list">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
</div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
var $l1 = $("#list").unwrap("div");
});
</script>
</html>
● wrap()
添加父元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
#d1{
width: 300px;
height: 300px;
background-color: greenyellow;
}
#d2{
width: 300px;
height: 300px;
background-color: red;
}
</style>
</head>
<body>
<button id="btn">去除</button>
<button id="addbtn">添加</button>
<div id="d1">
<ul id="list">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
</div>
<hr/>
<div id="d2"></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
var $l1 = $("#list").unwrap("#d1");
});
//为按钮绑定响应函数
$("#addbtn").click(function(){
var $l1 = $("#list").wrap("#d2");
});
</script>
</html>
● wrapAll()
添加父元素 (当前所有的元素看成一个整体添加元素)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
#d2{
width: 300px;
height: 300px;
background-color: red;
}
</style>
</head>
<body>
<button id="addbtn">添加</button>
<ul id="list">
<li>牛魔王</li>
<li>铁扇公主</li>
<li>红孩儿</li>
</ul>
<hr/>
<div id="d2"></div>
<script>
//为按钮绑定响应函数
$("#addbtn").click(function(){
var $l1 = $("#list li").wrapAll("#d2");
});
</script>
</html>
● wrapInner()
在元素内部增加一层
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
#d2{
width: 300px;
height: 300px;
background-color: red;
}
</style>
</head>
<body>
<button id="addbtn">添加</button>
<ul id="list">
<li id="d">牛魔王</li>
<li>铁扇公主</li>
<li>红孩儿</li>
</ul>
<hr/>
<div id="d2"></div>
<script>
//为按钮绑定响应函数
$("#addbtn").click(function(){
var $l1 = $("#list #d").wrapInner("#d2");
});
</script>
</html>
● append()
添加子元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//复制jQuery元素,当参数为true,元素上的事件也会被复制
var $l1 = $("#l1").clone(true);
$("#list1").append($l1);
});
</script>
</html>
● appendTo()
添加到父元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//复制jQuery元素,当参数为true,元素上的事件也会被复制
var $l1 = $("#l1").clone(true);
$l1.appendTo($("#list1"));
});
</script>
</html>
● prepend()
向前添加子元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//复制jQuery元素,当参数为true,元素上的事件也会被复制
var $l1 = $("#l1").clone(true);
$("#list1").prepend($l1);
});
</script>
</html>
● prependTo()
添加到父元素前
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//复制jQuery元素,当参数为true,元素上的事件也会被复制
var $l1 = $("#l1").clone(true);
$l1.prependTo($("#list1"));
});
</script>
</html>
● html()
读取或设置html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
alert($("#list2").html());
});
</script>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
$("#list2").html("<li>蜘蛛精</li><li>玉兔精</li><li>大象精</li></li>");
});
</script>
</html>
● text()
读取或设置文本内容
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点我一下</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
alert($("#l1").text());
});
</script>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点我一下</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
$("#l1").text("玉面狐狸");
});
</script>
</html>
● after()
向后边添加元素(添加的师兄弟元素)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点我一下</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//after() 向后边添加元素(添加的师兄弟元素)
$("#l1").after($("<li>张三</li>"));
});
</script>
</html>
● insertAfter()
将元素添加到某元素的后边(添加的师兄弟元素)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点我一下</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//insertAfter() 将元素添加到某元素的后边(添加的师兄弟元素)
$("<li>张三</li>").insertAfter($("#l1"));
});
</script>
</html>
● before()
向前边添加元素(添加的师兄弟元素)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点我一下</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//after() 向后边添加元素(添加的师兄弟元素)
$("#l1").before($("<li>张三</li>"));
});
</script>
</html>
● insertBefore()
将元素添加到某元素的前边(添加的师兄弟元素)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点我一下</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//insertAfter() 将元素添加到某元素的后边(添加的师兄弟元素)
$("<li>张三</li>").insertBefore($("#l1"));
});
</script>
</html>
● detach()
删除元素(保留元素上的事件)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">删除</button>
<button id="btn2">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
var $l1 = $("#l1");
//为按钮绑定响应函数
$("#btn").click(function(){
//删除铁扇公主
$l1.detach();
});
$("#btn2").click(function(){
//删除铁扇公主
$("#list2").append($l1);
});
</script>
</html>
● empty()
删除所有子元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">删除</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
var $list2 = $("#list2");
//为按钮绑定响应函数
$("#btn").click(function(){
//清空列表
$list2.empty();
});
</script>
</html>
● remove()
删除元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">删除</button>
<button id="btn2">添加</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
var $l1 = $("#l1");
//为按钮绑定响应函数
$("#btn").click(function(){
//删除铁扇公主
$l1.remove();
});
$("#btn2").click(function(){
//删除铁扇公主
$("#list2").append($l1);
});
</script>
</html>
● replaceAll()
替换某个元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">替换</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//替换铁扇公主
$("<li>玉面狐狸</li></li>").replaceAll($("#l1"));
});
</script>
</html>
● replaceWith()
被某个元素替换
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">替换</button>
<ul id="list1">
<li>猪八戒</li>
<li>沙和尚</li>
<li>唐僧</li>
</ul>
<ul id="list2">
<li>牛魔王</li>
<li id="l1">铁扇公主</li>
<li>红孩儿</li>
</ul>
<script>
//为铁扇公主的li绑定点击事件
$("#l1").click(function(){
alert("我是铁扇公主~");
});
//为按钮绑定响应函数
$("#btn").click(function(){
//替换铁扇公主
$("#l1").replaceWith($("<li>玉面狐狸</li></li>"));
});
</script>
</html>
● attr()
设置/获取元素的指定属性,布尔值属性会返回实际值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">获取属性值</button>
<hr/>
<input type="text" readonly></input>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
alert($("input").attr("type"));
alert($("input").attr("readonly"));
$("input").attr("value","姓名")
});
</script>
</html>
● prop()
设置/获取元素的指定属性,布尔值属性会返回布尔值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">获取属性值</button>
<hr/>
<input type="text" readonly></input>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
alert($("input").prop("type"));
alert($("input").prop("readonly"));
$("input").prop("value","姓名")
});
</script>
</html>
● removeAttr()
移除属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">获取属性值</button>
<hr/>
<input type="text" readonly value="请填入姓名"></input>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("input").removeAttr("readonly");
$("input").removeAttr("value");
});
</script>
</html>
● val()
设置/获取元素的value属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">设置value</button>
<button id="btn2">获取value</button>
<hr/>
<input type="text" readonly></input>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("input").val("姓名")
});
$("#btn2").click(function(){
alert($("input").val());
});
</script>
</html>
● css()
读取/设置元素的css样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">设置css</button>
<button id="btn2">获取css</button>
<hr/>
<div></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("div").css("background-color","yellow")
$("div").css("width","200px")
$("div").css("height","200px")
});
$("#btn2").click(function(){
alert($("div").css("background-color"));
alert($("div").css("width"));
alert($("div").css("height"));
});
</script>
</html>
● height()
读取/设置元素的高度
● width()
读取/设置元素的宽度
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">设置css</button>
<button id="btn2">获取css</button>
<hr/>
<div></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("div").css("background-color","yellow")
$("div").height("200px")
$("div").width("200px")
});
$("#btn2").click(function(){
alert($("div").css("background-color"));
alert($("div").css("width"));
alert($("div").css("height"));
});
</script>
</html>
● innerHeight()
读取/设置元素的内部高度
● innerWidth()
读取/设置元素的内部宽度
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">设置css</button>
<button id="btn2">获取css</button>
<hr/>
<div></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("div").css("background-color","yellow");
$("div").css("padding","10px");
$("div").height("200px")
$("div").width("200px")
});
$("#btn2").click(function(){
alert($("div").css("background-color"));
alert($("div").css("width"));
alert($("div").css("height"));
alert($("div").innerHeight());
$("div").innerWidth("100px");
alert($("div").innerWidth());
});
</script>
</html>
● outerHeight()
读取/设置元素可见框的高度
● outerWidth()
读取/设置元素可见框的宽度
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">设置css</button>
<button id="btn2">获取css</button>
<hr/>
<div></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("div").css("background-color","yellow");
$("div").outerHeight("100px");
$("div").outerWidth("100px");
});
$("#btn2").click(function(){
alert($("div").css("background-color"));
alert($("div").outerHeight());
alert($("div").outerWidth());
});
</script>
</html>
● offset()
读取/设置元素的偏移量
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
div{
height: 300px;
width: 300px;
background-color: yellow;
}
</style>
</head>
<body>
<button id="btn">设置坐标</button></button>
<button id="btn2">获取坐标</button>
<hr/>
<div></div>
<script>
//为按钮绑定响应函数
$("#btn").click(function(){
$("div").offset({top:"200",left:"300"});
});
$("#btn2").click(function(){
alert($("div").offset().top);
alert($("div").offset().left);
});
</script>
</html>
● position()
读取元素相当于包含块的偏移量
● scrollLeft()
读取/设置元素水平滚动条的位置
● scrollTop()
读取/设置元素垂直滚动条的位置
● eq()
获取指定索引的元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").eq(1).css("background-color","#bfa");
});
});
</script>
</html>
● even()
获取索引为偶数的元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").even().css("background-color","#bfa");
});
});
</script>
</html>
● odd()
获取索引为奇数的元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").odd().css("background-color","#bfa");
});
});
</script>
</html>
● filter()
筛选元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1 a"></div>
<div class="box1"></div>
<div class="box1 a"></div>
<div class="box1 a"></div>
<div class="box1 a"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").filter(".a").css("background-color","#bfa");
});
});
</script>
</html>
● first()
获取第一个元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").first().css("background-color","#bfa");
});
});
</script>
</html>
● last()
获取最后一个元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").last().css("background-color","#bfa");
});
});
</script>
</html>
● has()
获取含有指定后代的元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"><span>啦啦啦</span></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").has("span").css("background-color","#bfa");
});
});
</script>
</html>
● is()
检查是否含有某元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
alert($(".box1").is("div"));
});
});
</script>
</html>
● map()
获取对象中的指定数据
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$("p").append($("input").map(function(){
return $(this).val();
}).get().join(", "));
});
});
</script>
</head>
<body>
<div>
<button id="btn">点我</button></button>
<hr/>
<p>值:</p>
<form>
<input type="text" name="name" value="脚本无忧"/>
<input type="text" name="password" value="123456"/>
<input type="text" name="url" value="https://www.jb51.net"/>
</form>
</div>
</body>
</html>
● slice()
截取元素(切片)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").slice(2,5).css("background-color","#bfa");
});
});
</script>
</html>
● add()
创建包含当前元素的新的jQuery对象
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
.box2{
float: left;
width: 200px;
height: 200px;
border: 1px orange solid;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box2"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").add(".box2").css("background-color","#bfa");
});
});
</script>
</html>
● addBack()
将之前操作的集合中的元素添加到当前集合中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
.box2{
float: left;
width: 200px;
height: 200px;
border: 1px orange solid;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"><span>我是span</span></span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box2"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").contents().addBack().css("background-color","#bfa");
});
});
</script>
</html>
● contents()
获取当前jQuery对象的所有子节点(包括文本节点)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
.box2{
float: left;
width: 200px;
height: 200px;
border: 1px orange solid;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"><span>我是span</span></span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box2"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").contents().css("background-color","#bfa");
});
});
</script>
</html>
● end()
将筛选过的列表恢复到之前的状态
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").slice(2,5).css("background-color","#bfa")
.end()
.css("border-color","blue");
});
});
</script>
</html>
● not()
从列表中去除符合条件的元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"></div>
<div class="box1" id="a"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"><span>啦啦啦</span></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").not("#a").css("background-color","#bfa");
});
});
</script>
</html>
● children()
获取子元素
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
<style>
.box1{
float: left;
width: 100px;
height: 100px;
border: 1px red solid;
margin: 10px;
}
.box2{
float: left;
width: 200px;
height: 200px;
border: 1px orange solid;
}
</style>
</head>
<body>
<button id="btn">点我</button></button>
<hr/>
<div class="box1"><span>我是span</span></span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"><span>我是span</span></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box1"></div>
<div class="box2"></div>
<script>
//为按钮绑定响应函数
$(function(){
$("#btn").click(function(){
$(".box1").children().css("background-color","#bfa");
});
});
</script>
</html>
● closest()
获取离当前元素最近的指定元素
● find()
查询指定的后代元素
● next()
获取后一个兄弟元素
● nextAll()
获取后边所有的兄弟元素
● nextUntil()
获取后边指定位置的兄弟元素
● offsetParent()
获取定位父元素
● parent()
获取父元素
● parents()
获取所有的祖先元素
● parensUntil()
获取指定的祖先元素
● prev()
获取前边的兄弟元素
● prevAll()
获取前边所有的兄弟元素
● prevUntil()
获取指定的兄弟元素
● siblings()
获取所有的兄弟元素
7. 点击事件
⑴ jQuery普通的事件绑定
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点击</button></button>
<script>
$("#btn").click(function(){
alert("123");
});
</script>
</html>
⑵ jQuery取消默认的事件
默认效果演示:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<a id="linkA" href="https://wwww.baidu.com">点击</a>
<script>
$("#linkA").click(function(){
alert("123");
});
</script>
</html>
通过return的方式解决
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<a id="linkA" href="https://wwww.baidu.com">点击</a>
<script>
$("#linkA").click(function(){
alert("123");
return false;
});
</script>
</html>
⑶ jQuery on绑定事件和off取消绑定
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点击事件</button>
<button id="btn2">取消事件2</button>
<script>
$("#btn").on("click.a",function(){
alert("事件1");
});
$("#btn").on("click.b",function(){
alert("事件2");
});
$("#btn").on("click.c",function(){
alert("事件3");
});
$("#btn2").on("click",function(){
//off用来取消事件
$("#btn").off("click.b");
});
</script>
</html>
⑷ jQuery解决事件冒泡问题
冒泡问题演示:当button点击了,其父元素body上的事件也被出触发了
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点击</button></button>
<script>
$("#btn").click(function(){
alert("123");
});
$(document.body).click(function(){
alert("455");
});
</script>
</html>
通过even事件中的属性取消冒泡问题
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./js/jquery-3.6.1.min.js"></script>
</head>
<body>
<button id="btn">点击</button></button>
<script>
$("#btn").click(function(even){
even.stopPropagation();
alert("123");
});
$(document.body).click(function(){
alert("455");
});
</script>
</html>