首页 前端知识 前端技术(三)—— javasctipt 介绍:jQuery方法和点击事件介绍(补充)

前端技术(三)—— javasctipt 介绍:jQuery方法和点击事件介绍(补充)

2024-07-24 23:07:30 前端知识 前端哥 212 898 我要收藏

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

<!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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

<!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>

在这里插入图片描述

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>

在这里插入图片描述

<!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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

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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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述
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>

在这里插入图片描述

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>

在这里插入图片描述

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>

在这里插入图片描述
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>

在这里插入图片描述

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