55、前端jQuery之css

1、自定义模态框实例：

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>自定义模态框示例</title>
    <style>
        .cover {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            background-color: rgba(0,0,0,0.4);
            z-index: 998;
        }

        .modal {
            height: 400px;
            width: 600px;
            background-color: white;
            position: absolute;
            top: 50%;
            left: 50%;
            margin-left: -300px;
            margin-top: -200px;
            z-index: 1000;
        }
        .hide {
            display: none;
        }
    </style>
</head>
<body>
<button id="b1">屠龙宝刀,点击就送!</button>
<div class="cover hide"></div>
<div class="modal hide">
    <form>
        <p>
            <label>用户名:
                <input type="text">
            </label>
        </p>
        <p>
            <label>密码:
                <input type="password">
            </label>
        </p>
        <p>
            <input type="submit" value="登录">
            <input id="cancel" type="button" value="取消">
        </p>
    </form>
</div>
<script src="jquery-3.2.1.min.js"></script>
<script>
    // 找到点击弹出模态框的按钮
    $("#b1").click(function () {
        // 把.cover和.modal显示出来(去除掉.hide)
        $(".cover").removeClass("hide");  // 显示背景
        $(".modal").removeClass("hide"); // 显示模态框
    });

    // 找到取消按钮,绑定事件
    $("#cancel").click(function () {
        // 给背景和模态框都加上hide类
        $(".cover").addClass("hide");
        $(".modal").addClass("hide");
    })
</script>
</body>
</html>
自定义模态框
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>自定义模态框</title>
    <style>
        .cover{
            position:absolute;
            top:0;
            left:0;
            right:0;
            bottom:0;
            z-index:998;
            background-color: rgba(0,0,0,0.4);
        }
        .modal{
            width:600px;
            height:400px;
            position:absolute;
            top:50%;
            left:50%;
            background-color: white;
            z-index:1000;
            margin-left:-300px;
            margin-top:-200px;
        }
        .hide{
            display:none;
        }
    </style>
</head>
<body>
<button id="b1">点击弹窗</button>
<div class="cover hide"></div>
<div class="modal hide">
    <form action="">
        <p>
            <label for="username">
                <input type="text" name="username">用户名
            </label>
        </p>

        <p>
            <label for="password">
                <input type="text" name="password">密码
            </label>
        </p>
        <p>
            <input type="button" id="cancel" value="取消">
        </p>

    </form>
</div>

<script src="jquery-3.2.1.min.js"></script>
<script>
    $("#b1").click(function () {
        $(".cover").removeClass("hide");
        $(".modal").removeClass("hide");
    });
    $("#cancel").click(function () {
        $(".cover").addClass("hide");
        $(".modal").addClass("hide");

    })
</script>

</body>
</html>
我自己做的略略略略略~

 2、修改CSS样式

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>修改CSS样式</title>
</head>
<body>

<p>乔小强</p>
<p>二哥</p>
<script src="jquery-3.2.1.min.js"></script>
<script>
    $("p").click(function () {
        // 把当前点击的标签变绿
        // 在处理事件的函数中用 this 表示 当前触发事件的标签
//        $(this).css("color", "red");
//        $(this).css("font-size", "24px");

        $(this).css({"color": "pink", "font-size": "48px"});
    })
</script>
</body>
</html>
修改css样式
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>修改css样式</title>
</head>
<body>

    <p>
        点击    变大变粗哦……
    </p>

    <p>
        听我娇喘~
    </p>


<script src="jquery-3.2.1.min.js"></script>
    <script>
        $("p").click(function () {
//            $(this).css({"color":"red","font-size":"48px"})
            $(this).css("color","red");
            $(this).css("font-size","48px");

        })
    </script>
我自己做的略略略~

 3、返回顶部

<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="x-ua-compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>位置相关示例之返回顶部</title>
  <style>
       * {
           margin: 0;
       }
    .c1 {
      width: 100px;
      height: 200px;
      background-color: red;
    }

    .c2 {
      height: 50px;
      width: 50px;

      position: fixed;
      bottom: 15px;
      right: 15px;
      background-color: #2b669a;
    }
    .hide {
      display: none;
    }
    .c3 {
      height: 100px;
    }
  </style>
</head>
<body>
<button id="b1" class="btn btn-default">点我</button>
<div class="c1"></div>
<div class="c3">1</div>
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<button id="b2" class="btn btn-default c2 hide">返回顶部</button>
<script src="jquery-3.2.1.min.js"></script>
<script>
  $(window).scroll(function () {
    if ($(window).scrollTop() > 100) {
      $("#b2").removeClass("hide");
    }else {
      $("#b2").addClass("hide");
    }
  });
  $("#b2").click(function () {
    $(window).scrollTop(0);
  })
</script>
</body>
</html>
返回顶部示例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>返回顶部</title>
    <style>
        .c {
            width: 300px;
            height: 500px;
            background-color: red;
            color: green;
        }

        .c1 {
            height: 100px;
        }

        .cc {
            width: 80px;
            height: 50px;

            position: fixed;
            bottom: 15px;
            right: 15px;
            background-color: #2b669a;
        }

        .hide {
            display: none;
        }

    </style>
</head>
<body>

<button id="btn">点击</button>
<form action="">
    <input class="cc hide" type="button" value="返回顶部">
</form>
<div class="c">nihai</div>
<div class="c1">1</div>
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<script src="jquery-3.2.1.min.js"></script>
<script>
    $(window).scroll(function () {
        if ($(window).scrollTop() > 200) {
            $(".cc").removeClass("hide");
        } else {
            $(".cc").addClass("hide")
        };
    $(".cc").click(function () {
        $(window).scrollTop(0);

    })
    })

</script>


</body>
</html>
我自己做的……

 4、全选、取消与反选

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>全选与取消</title>
</head>
<body>

<table border="1">
    <thead>
    <tr>
        <th>#</th>
        <th>姓名</th>
        <th>职位</th>
    </tr>
    </thead>


    <tbody>
    <tr>
        <td><input type="checkbox"></td>
        <td>苍井空</td>
        <td>艺术家</td>
    </tr>
    <tr>
        <td><input type="checkbox"></td>
        <td>余快</td>
        <td>科学家</td>
    </tr>
    <tr>
        <td><input type="checkbox"></td>
        <td>赵海超</td>
        <td>资源收藏者</td>
    </tr>
    </tbody>
</table>
<input type="button" value="全选" id="b1">
<input type="button" value="反选" id="b2">
<input type="button" value="取消" id="b3">

<script src="jquery-3.2.1.min.js"></script>

<!--全选-->
<script>
    $("#b1").click(function () {
        $(":checkbox").prop("checked", true);
    });
    $("#b3").click(function () {
        $(":checkbox").prop("checked",false);
    });
    $("#b2").click(function () {
        var $cb = $(":checkbox");
        for (var i=0;i<$cb.length;i++){
            if ($($cb[i]).prop("checked")){
              $($cb[i]).prop("checked",false)
          }else{
              $($cb[i]).prop("checked",true)
          }
        }

    })


</script>


</body>
</html>
全选、取消全选与反选
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原文地址：https://www.cnblogs.com/wangyuxing/p/8574034.html