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  • css层叠样式表

    css 层叠样式表

    作用:
        - 颜色
        - 位置
    注释 /*  这是注释  */
    形式
        - 内嵌样式 标签style
        - 内联样式 head style
        - 外联样式 单独文件
    选择器
        - id选择器 #
        - class选择器 .
        - 标签选择器
        - 层级选择器 空格隔开父-子
        - 组合选择器 逗号隔开同级元素
        - 属性选择器 [] 里边写属性=值
    优先级:
        style由上至下
    边框 border  宽度 样式 颜色
    height高度  width宽度  像素,百分比
    text-align:center水平位置,
    line-height行高 垂直方向居中
    color字体颜色
    font-size字体大小
    font-weight字体加粗
    float  标签漂浮,块级标签堆叠
            老子管不住:clear:both
    display
        - inline 行内显示 无法设置高度,宽度,边距
        - block 块级显示 可以设置高度,宽度,边距
        - none 不显示
        - inline-block 双重属性
    padding  内边距
    margin  外边距
    代码重用
        两个样式相同的部分可以单独提出来
    自适应media
    布局变形解决办法:最外层用绝对宽度,内部可以使用百分比
    img标签,默认有1像素的边框,border:0;
    position
        - fixed 固定
        - relative+absolute 相对定位+绝对定位
    z-index: 层级顺序,立体堆叠,值越大越靠前
    opacity:模糊度0-1
    overflow:auto  hidden
    hover
    background-image: url("img/icon.png"); 默认重复
    background-repeat: no-repeat;
    background-position-x:0; 相当于扣了一个小洞
    background-position-y:0;
    

    代码实例

    float

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .pg-head{
                height: 38px;
                background-color: darkgray;
            }
            .pg-head-left{
                float: left;
            }
            .pg-head-right{
                float: right;
            }
            .pg-body{
                 900px;
                height:400px;
                border: 1px solid red;
    
            }
            .pg-element{
                 150px;
                height:200px;
                border: 1px solid green;
                float: left;
            }
        </style>
    </head>
    <body style="margin: 0 auto;">
        <div class="pg-head">
            <div class="pg-head-left">左边的内容</div>
            <div class="pg-head-right">右边的内容</div>
        </div>
    
        <div class="pg-body">
            <div class="pg-element">内部元素</div>
            <div class="pg-element">内部元素</div>
            <div class="pg-element">内部元素</div>
            <div class="pg-element">内部元素</div>
            <div class="pg-element">内部元素</div>
            <div class="pg-element">内部元素</div>
            <div style="clear: both"></div>
        </div>
    
    </body>
    </html>

    效果 
    这里写图片描述

    fixed

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            body{
                margin: 0 auto;
            }
            .pg-head{
                background-color: black;
                color:white;
                position: fixed;
                 100%;
                height: 48px;
                top:0;
                text-align: center;
                line-height: 48px;
            }
            .pg-body{
                height: 5000px;
                background-color: #dddddd;
                margin-top: 48px;
                color:green;
                text-align: center;
                font-size:50px;
            }
            #pg-goto-top{
                 80px;
                height: 50px;
                background-color: black;
                position: fixed;
                right: 10px;
                bottom:10px;
                color:white;
                text-align: center;
                line-height: 50px;
            }
        </style>
    </head>
    <body>
        <div class="pg-head">顶部内容</div>
        <div class="pg-body">主体内容</div>
        <div onclick="gotoTop()" id="pg-goto-top">返回顶部</div>
        <script>
            function gotoTop() {
                document.body.scrollTop=0;
            }
        </script>
    </body>
    </html>

    效果

    这里写图片描述

    background

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .icon{
                 18px;
                height: 18px;
                background-image: url("img/icon.png");
                background-repeat: no-repeat;
                background-position-x:0;
                /*border: 1px solid green;*/
                float: left;
                margin-right:10px ;
            }
            .icon-1{background-position-y:0;}
            .icon-2{background-position-y:-20px;}
            .icon-3{background-position-y:-40px;}
            .icon-4{background-position-y:-60px;}
            .icon-5{background-position-y:-100px;}
            .icon-6{background-position-y:-120px;}
            .icon-7{background-position-y:-140px;}
            .icon-8{background-position-y:-160px;}
            .icon-9{background-position-y:-180px;}
        </style>
    </head>
    <body>
    <p>原图:</p>
    <div>
        <img src="img/icon.png" alt="">
    </div>
    <p>背景图:</p>
    <div class="icon icon-1"></div>
    <div class="icon icon-2"></div>
    <div class="icon icon-3"></div>
    <div class="icon icon-4"></div>
    <div class="icon icon-5"></div>
    <div class="icon icon-6"></div>
    <div class="icon icon-7"></div>
    <div class="icon icon-8"></div>
    <div class="icon icon-9"></div>
    </body>
    </html>

    icon.png 
    这里写图片描述

    效果 
    这里写图片描述

    hover

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            body{
                margin: 0 auto;
                height: 5000px;
            }
            .pg-head{
                background-color: #2459a2;
                height:48px;
                position: fixed;
                top:0;
                left:0;
                right:0;
                color:white;
                line-height: 48px;
            }
            .w{
                960px;
                margin: 0 auto;
             }
            .pg-body{
                margin-top: 50px;
            }
            .pg-head .menu{
                display: inline-block;
                padding: 0 20px;
            }
            /*鼠标经过生效*/
            .pg-head .menu:hover{
                background-color: #0d3ea2;
            }
    
        </style>
    </head>
    <body>
    <div class="pg-head">
        <div class="w">
            <a class="logo" >logo</a>
            <a class="menu" >主页</a>
            <a class="menu" >段子</a>
            <a class="menu" >图片</a>
            <a class="menu" >1024</a>
        </div>
    </div>
    <div class="pg-body">
        <div class="w">这里是主体内容</div></div>
    </body>
    </html>

    效果 
    这里写图片描述

    login

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .login{
                 300px;
                height:35px;
                position: relative;
                display: inline-block;
            }
            .icon{
                height: 35px;
                 35px;
                background-image: url("img/pwd-icons-new.png");
                background-repeat: no-repeat;
                background-position-x: 0;
                background-position-y: -48px;
                position: absolute;
                top:3px;
                right:-15px;
    
            }
            input{
                 275px;
                height:35px;
                font-size:20px;
                padding-right:40px;  /*右边内边距增加*/
            }
            label{
                height:35px;
            }
        </style>
    </head>
    <body>
        <label for="username">登陆:</label>
        <div class="login">
            <input id="username" type="text">
            <span class="icon"></span>
        </div>
    </body>
    </html>

    pwd-icons-new.png (来自京东商城登陆页面) 
    这里写图片描述

    显示效果 
    这里写图片描述

    margin-padding

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .pg-margin{
                border:1px solid red;
                200px;
                height:200px
            }
            .pg-margin-box{
                border:1px solid green;
                180px;
                height:180px;
                background-color: green;
                margin:10px;
            }
            .pg-padding{
                border:1px solid red;
                180px;
                height:180px;
                padding: 10px
            }
            .pg-padding-box{
                border:1px solid green;
                180px;
                height:180px;
                background-color: green
            }
        </style>
    </head>
    <body>
        <div class="pg-margin">
            <div class="pg-margin-box">
                外边距margin
            </div>
        </div>
    
        <div class="pg-padding">
            <div class="pg-padding-box">
                内边距padding
            </div>
        </div>
    </body>
    </html>

    显示效果 
    这里写图片描述

    overflow

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    
    <!--超出范围隐藏-->
    <div style="200px; height: 200px;overflow: hidden">
        <img src="img/sun.jpg" alt="">
    </div>
    
    <!--超出范围出现滚动条-->
    <div style="200px; height: 200px;overflow: auto">
        <img src="img/sun.jpg" alt="">
    </div>
    </body>
    </html>

    图片: 
    这里写图片描述

    显示效果: 
    这里写图片描述

    property

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            div{
                border: 1px solid red;  /* 边框 */
                 200px;  /**/
                height: 200px;  /**/
                text-align: center;  /* 水平居中 */
                line-height: 200px;  /* 垂直居中 */
                color: green;  /* 字体颜色 */
                font-size: 20px;  /* 字体大小 */
                font-weight: bold;  /* 字体加粗 */
            }
        </style>
    </head>
    <body>
    <div>简单的div测试</div>
    </body>
    </html>

    显示效果 
    这里写图片描述

    selector

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            /*标签选择器*/
            p{
                background-color:green;
            }
            /*id选择器*/
            #i1{
                background-color:yellow;
            }
            /*类选择器*/
            .c1{
                background-color:blue;
            }
            /*层级选择器*/
            div p{
                background-color:red;
            }
            /*组合选择器*/
            #i2, .c2{
                background-color:orange;
            }
            /*属性选择器*/
            p[color="pink"]{
                background-color:pink;
            }
        </style>
    
    
    </head>
    <body>
    
    <p>标签选择器 green</p>
    <p id="i1">id选择器 yellow</p>
    <p class="c1">类选择器 blue</p>
    <div><p>层级选择器 red</p></div>
    <p class="c2">组合选择器 orange</p>
    <p id="i2">组合选择器 orange</p>
    <p color="pink">属性选择器 pink</p>
    
    </body>
    </html>

    显示效果 
    这里写图片描述

    z-index

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            body{
                margin: 0 auto;
            }
            .pg-body{
                height: 5000px;
                background-color: #dddddd;
                color:green;
            }
            .pg-background{
                z-index:9;
                background-color: orange;
                position: fixed;
                top:0;bottom:0;
                left:0;
                right:0;
                opacity:0.5;
                /*display:none*/
            }
            .pg-box{
                z-index:10;
                background-color: white;
                500px;
                height:400px;
                position:fixed;
                top:50%;
                left:50%;
                margin-top:-200px;
                margin-left: -250px;
                /*display:none;*/
            }
        </style>
    </head>
    <body>
    <div class="pg-box"></div>
    <div class="pg-background"></div>
    <div class="pg-body">
       <button onclick="showBox()">注册</button>
    </div>
    
    </body>
    </html>

    显示效果 
    这里写图片描述

    布局实例

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <style>
        .pg-body-left-li{
            height:60px;
            line-height: 60px;
            background-color: coral;
            text-align: center;
            font-weight: bold;
            border:1px solid lawngreen;
        }
        .pg-body-right-div{
            150px;
            height:220px;
            background-color: #dddddd;
            padding: 10px;
            float:left;
            margin-right: 10px;
            margin-bottom: 10px;
        }
    </style>
    <body style="margin: 0 auto;">
    <!--页面头部部分-->
    <div style=" height:36px">
        <div style=" 960px;margin: 0 auto">
             <div style="float: left;line-height: 36px">收藏本站</div>
             <div style="float: right;line-height: 36px">登陆</div>
             <div style="float: right;line-height: 36px"> | </div>
             <div style="float: right;line-height: 36px">注册</div>
        </div>
    </div>
    
    <!--购物车-->
    <div style="960px;margin: 0 auto;height:36px">
        <div style="100px;height: 36px;line-height: 36px;text-align:center;float:right">购物车</div>
    </div>
    
    <!--导航栏-->
    <div style="height: 40px">
        <div style=" 960px; margin: 0 auto">
            <div style="float:left;color:white;line-height: 40px;margin: 0 50px">全部分类</div>
            <div style="float:left;color:white;line-height: 40px;margin-right: 10px">首页</div>
            <div style="float:left;color:white;line-height: 40px;margin-right: 10px">|</div>
            <div style="float:left;color:white;line-height: 40px;margin-right: 10px">天猫超市</div>
            <div style="float:right;color:white;line-height: 40px;">研究院</div>
            <div style="float:right;color:white;line-height: 40px;margin-right: 10px">|</div>
            <div style="float:right;color:white;line-height: 40px;margin-right: 10px">论坛</div>
        </div>
        <!--清除浮动-->
        <div style="clear: both;height:10px"></div>
    
        <!--主体部分-->
    <div style=" 960px;margin: 0 auto">
        <!--左边栏-->
        <div style="height:520px;200px;float:left;background-color: green">
            <div class="pg-body-left-li">南方水果</div>
            <div class="pg-body-left-li">南方水果</div>
            <div class="pg-body-left-li">南方水果</div>
            <div class="pg-body-left-li">南方水果</div>
            <div class="pg-body-left-li">南方水果</div>
            <div class="pg-body-left-li">南方水果</div>
    
        </div>
        <!--右边栏-->
        <div style="height:500px; 720px; float:right; padding:10px ">
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
            <div class="pg-body-right-div">
                <div style="height:180px;"></div>
                <div style="height: 5px"></div>
                <div style="height: 40px;line-height: 40px; text-align:center;商品信息</div>
            </div>
    
    
        </div>
    </div>
    </div>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/cainingning/p/9614934.html
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