CSS拾遗+技巧集合

1、实现尖角符号。

这是内联inline-block标签独有的特性。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .a{
            border-top:30px solid #000000 ;
            border-bottom: 30px solid #2c78d5;
            border-left:30px solid #1dd537 ;
            border-right: 30px solid #ff3021;
            display: inline-block;
        }
        .b{
            border-top:30px solid #000000 ;
            /*border-bottom: 30px solid #2c78d5;*/
            border-left:30px solid #1dd537 ;
            border-right: 30px solid #ff3021;
            display: inline-block;
        }
        .c{
            border: 30px solid transparent;
            /*transparent为透明色*/
            margin-top:20px ;
            display: inline-block;
            border-top:30px solid #000000 ;
        }
        .c:hover{
            margin-top:-10px ;
            border: 30px solid transparent;
             border-bottom:30px solid #000000;
        }
        .bb{
            border-top:30px solid #000000 ;
            /*border-bottom: 30px solid #2c78d5;*/
            border-left:30px solid #1dd537 ;
            border-right: 30px solid #ff3021;
            display: inline-block;
        }
        /*bb为自己想的方法,不需要改变自身的位置即可。*/
        /*bb和b为长方形,其他为正方形*/
        .bb:hover{
            margin-top:15px ;
            border: 0;
            border-bottom: 30px solid #2c78d5;
            border-left:30px solid #1dd537 ;
            border-right: 30px solid #ff3021;
        }
        .a:hover{

        }
    </style>
</head>
<body>
    <div class="a"></div>
<div class="b"></div>
    <div class="bb"></div>
<div style="background-color: #ff3021;height: 70px">
    <div class="c"></div>
</div>
</body>
</html>
View Code

鼠标临幸前:

鼠标临幸后:

 

2、实现输入框最后有小图标

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <style>
 7         .login{
 8             position: relative;
 9             /*父级标签 position为 relative时,子标签才会根据父级标签定位。否则一级一级找,找不到就根据body定位*/
10         }
11         .login input{
12             width: 170px;
13             padding-right: 20px;
14             /*达到输入到R处就不增长的效果*/
15             height: 30px;
16         }
17         .ren{
18             position: absolute;
19             /*根据父标签 来定位。*/
20             top: 8px;
21             left: 180px;
22         }
23     </style>
24 </head>
25 <body>
26 <div class="login">
27     <input type="text">
28     <span class="ren">R</span>
29 </div>
30 </body>
31 </html>
View Code

输入前:

输入后:

  文字不会超过“R”的位置,通过设置padding-right.

3、实现购物加减按钮

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .left{
            float: left;
        }
        /*公用left*/
        .w{
            width: 96px;
            border: 1px solid #ddd;
            height: 22px;
        }
        .jia{
            text-align: center;
            line-height: 22px;
            height: 22px;
            width: 22px;
            cursor: pointer;
        /*鼠标放上去时,变成小手*/
        }
        .text{
            height: 22px;
            width: 50px;
            padding: 0;
            border: 0;
            border-left: 1px solid #ddd ;
            border-right: 1px solid #ddd ;
        }
        /*输入框左右2边各1px边框。*/
    </style>
</head>
<body>
<div class="w">
    <div class="jia left">+</div>
        <input type="text" class="text left">
    <div class="jia left">-</div>
</div>
</body>
</html>
View Code

 

4、页面布局

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            margin: 0;
        }
        .top{
            height: 48px;
            width: 100%;
            background-color: #7d7d7d;
        }
        .left{
            position: absolute;
            top:48px;
            left: 0px;
            width: 180px;
            bottom: 0;
            background-color: #1dd537;
        }
        .right{
            position: absolute;
            top:48px;
            right: 0px;
            left: 183px;
            bottom: 0;
            background-color: #1c6a9e;
            overflow: auto;
            /*如果内容超过自动长度,就会生成一个滚动条*/
        }
    </style>
</head>
<body>
<div class="top">

</div>
<div class="left">
    <ul>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
</div>
<div class="right">
    <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1>
     <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1> <h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1><h1>333</h1>
</div>
</body>
</html>
View Code

这里最重要的就是:overflow: auto;如果内容超过自动长度,就会生成一个滚动条.

图上这个滚动条是属于蓝色背景的,非页面的滚动条

 

5、实现模态对话框

 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*分为3层 1、最底层内容  2、一个遮罩层 3、对话框层*/
        .zhezhao{
            background-color: rgba(0,0,0,0.4);
            position: fixed;
            top:0;
            left: 0;
            bottom: 0;
            right: 0;
            z-index: 2;
            /*优先级 比较低*/
        }
        .kuang{
            width: 350px;
            height: 250px;
            /*5行*/
            position: fixed;
            top:50%;
            left: 50%;
            margin-left: -175px;
            margin-top:-125px;
            /*这5行  实现了真正的居中,margin的是框长宽的一半*/
            background-color: white;
            z-index: 3;
            /*优先级 比较高 在最上边显示*/
        }
    </style>
</head>
<body>
    <div><h1>Mr很大的龙</h1></div>
<div class="zhezhao">
</div>
<div class="kuang"></div>
</body>
</html>
View Code

 

 

 

6、伪类选择器补充

伪类选择器 可以对别的标签样式修改,例如:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .touch{
            background-color: #1c6a9e;
            width: 300px;
            height: 300px;
            overflow: hidden;
            position: relative;
            /*用来给子标签提供定位参考*/
        }
        .touch .content{
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom:0;
            /*占满父级标签*/
            background:rgba(0,0,0,0.6);
            /*设置透明度*/
            color: white;
            text-align: center;
            visibility: hidden;
            /*隐藏起来*/
        }
        .touch:hover .content{
            visibility: visible;
        }
        /*当touch被鼠标临幸时,修改content为显示*/
        .touch .c1{
            font-size: 32px;
            /*padding: 60px 0;*/
            line-height: 300px;
        }
    </style>
</head>
<body>
    <div class="touch">
        <div class="img"><img src="http://pic.iqshw.com/d/file/qita/weixin/2016/07/04/74af10abec5420f74c6c172dab6969a4.jpg"></div>
        <div class="content c1">
            大龙
        </div>
    </div>
</body>
</html>
View Code

鼠标临幸前:

 

鼠标临幸后:

 

7、css代码保护样式不被修改(优先级)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .a{
            color: #ff3021 !important;
            /*当一句css代码 后边跟!important的时候,下边的普通代码改变不了*/
            font-size:50px ;
        }
        .b{
            color: #1dd537 ;
            /*试图改变颜色*/
        }
    </style>
</head>
<body>
<div class="a b">Mr很大的龙</div>
</body>
</html>
View Code

按照CSS执行顺序来说,文字应该是绿色,但文字为红色,因为被后边的“!important”保护

 

 

 

8、用position进行定位

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div style="height: 2000px;width: 1000px">
<div style="width: 500px;height: 200px;margin: 0 auto;background-color: #2c78d5">
    <!--有一定的宽度在设置margin:0 auto 可以让该标签左右居中-->
    <div style="width: 300px;height: 100px;margin: 0 auto;background-color:#Fc78d5;position: relative">
        <!--父级设置了relative-->
        <div style="width: 30px;height: 30px;margin: 0 auto;background-color:#f7fc42;position:absolute;bottom: 0;left: 0"></div>
        <!--子标签会根据最近的relative来进行定位-->
    </div>
</div>
<div style="width: 50px;height: 50px;margin: 0 auto;background-color: #1dd537;position: fixed;top: 30px;right: 50px;">
    <!--fixed 用来绝对定位,根据窗口来定位,滑动滚轮,位置也不会改变-->
</div>
</body>
</html>
View Code

当滚动条在最顶端时:

当滚动条在下边时:可以看到绿色块保持的位置是不变的。这就是position的 fixed属性

 

posted @ 2016-07-05 10:44  很大的龙  阅读(407)  评论(0编辑  收藏  举报