CSS网页案例-黑马

项目目录

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>项目目录</title>
</head>
<body>
    <ul>
        <li>xtx-pc
            <ul>
                <li>images 文件夹: 存放固定使用的图片素材,例如: logo样式修饰图等等</li>
                <li>uploads 文件夹:存放非固定使用的图片素材,例如:商品图、宣传图需要上传的图片</li>
                <li>iconfont 文件夹:字体图标素材</li>
                <li>css 文件夹:存放CSS文件 (link 标签引入)
                    <ul>
                        <li>base.css:基础公共样式</li>
                        <li>common.css:各个网页相同模块的重复样式,例如:头部、底部</li>
                        <li>index.css:首页 CSS 样式</li>
                    </ul>
                </li>
                <li>index.html:首页HTML文件</li>
            </ul>
        </li>
    </ul>
</body>
</html>

SEO三大标签

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>SEO三大标签</title>  
</head>
<body>
    <h3>SEO三大标签</h3>
    <strong>SEO: 搜索引擎优化,</strong>提升网站百度搜索排名 <br>
    提升SEO常见方法 <br>
    <ul>
        <li>竞价排名</li>
        <li>将网页制作成html后缀</li>
        <li>标签语义化(在合适的地方使用合适的标签)</li>
    </ul>
    网页头部SEO标签:
    <ul>
        <li>title:网页标题标签</li>
        <li>description: 网页描述</li>
        <li>keywords:网页关键词</li>
    </ul>
    
</body>
</html>

Favicon图标

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Favicon图标</title>
</head>
<body>
    <h3>Favicon图标</h3>
    <strong>Favicon图标</strong>   <br>
    Favicon 图标:网页图标,出现在浏览器标题栏增加网站辨识度。 <br>
    图标: favicon.ico,一般存放到网站的根目录里面 <br>
    <img src="./img/Favicon图标.png" alt="">
</body>
</html>

版心

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>版心</title>
</head>
<body>
    <h3>版心</h3>
    wrapper 版心宽度: 1240px <br>
</body>
</html>

快捷导航

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>快捷导航(shortcut)</title>
</head>
<body>
    <h3>快捷导航(shortcut)</h3>
    <strong>结构 > 版心 > 导航ul </strong> <br>
</body>
</html>

案例

base

/* 去除常见标签默认的 margin 和 padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* 设置网页统一的字体大小、行高、字体系列相关属性 */
  body {
    font: 16px/1.5  "Microsoft Yahei",
      "Hiragino Sans GB", "Heiti SC", "WenQuanYi Micro Hei", sans-serif;
    color: #333;
  }
  
  /* 去除列表默认样式 */
  ul,
  ol {
    list-style: none;
  }
  
  /* 去除默认的倾斜效果 */
  em,
  i {
    font-style: normal;
  }
  
  /* 去除a标签默认下划线,并设置默认文字颜色 */
  a {
    text-decoration: none;
    color: #333;
  }
  
  /* 设置img的垂直对齐方式为居中对齐,去除img默认下间隙 */
  img {
    width: 100%;
    height: 100%;
    vertical-align: middle;
  }
  
  /* 去除input默认样式 */
  input {
    border: none;
    outline: none;
    color: #333;
  }
  
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    font-weight: 400;
  }
  
  

common

/* 头尾各个页面相同的样式 */
/* 版心 */
.wrapper  {
    margin: 0 auto;
    width: 1240px;
}

/* 快捷导航 */
.shortcut {
    height: 52px;
    background-color: #333;
}
.shortcut .wrapper {
    display: flex;
    justify-content: flex-end;
    height: 52px;
    /* background-color: pink; */
}
.shortcut .wrapper ul {
    display: flex;
    line-height: 52px;
}
.shortcut .wrapper li a {
    padding: 0 15px;
    font-size: 14px;
    color: #fff;
    border-right: 1px solid #999;
}
.shortcut .wrapper li:last-child a {
    border-right: 0;
} 
.shortcut li .iconfont {
    margin-right: 4px;
    vertical-align: middle;
}

/* 头部 */
.header {
    height: 88px;
    /* background-color: pink; */
    margin-top: 22px;
    margin-bottom: 22px;
    display: flex;
}
.header .logo {
    width: 200px;
    height: 88px;
    margin-right: 40px;
}
.logo a {
    display: block;
    width: 200px;
    height: 88px;
    background-image: url(../images/logo.png);
    font-size: 0;
}
.header .nav {
    margin-top: 33px;
    margin-right: 28px;
}
.nav ul {
    display: flex;
}
.nav li {
    margin-right: 47px;
}
.nav li a {
    padding-bottom: 10px;
    /* background-color: skyblue; */
}
.nav li a:hover {
    border-bottom: 2px solid #5EB69C;
    color: #5EB69C;
}
.header .search {
    margin-top: 33px;
    margin-right: 45px;
    height: 34px;
    width: 170px;
    border-bottom: 2px solid #f4f4f4;
}
.header .search {
display: flex;
}
.header .search .iconfont {
    margin-right: 8px;
    font-size: 18px;
    color: #ccc;
}
.search input {
    /* 淘觉器优先生效 input 标签的默认宽度。所以 flex: 1 不生效 */
    /* 解决办法:而置 input 默认宽度 width: */
    flex: 1;
    width: 0;

}
.search input::placeholder {
    font-size: 16px;
    color: #ccc;
}
.cart {
    position: relative;
    margin-top: 32px;
}
.cart .iconfont {
    font-size: 24px;
}
.cart i {
    position: absolute;
    top: 1px;
    /* right 右对齐向左撑开,,left 向右撑开 */
    left: 15px;
    height: 15px;
    padding-right: 6px;
    padding-left: 6px;
    background-color: rgb(255, 94, 0);
    border-radius: 5px;
    line-height: 15px;
    font-size: 14px;
    color: #f4f4f4;
}
/* 底部 */
.footer {
    height: 580px;
    background-color: #f5f5f5;
}
/* 服务 */
.service {
    padding: 60px 0;
    height: 178px;
    border-bottom: 1px solid #E8E8E8;
}
.service ul {
    display: flex;
    justify-content: space-evenly;
}
.service li {
    display: flex;
    width: 190px;
    height: 58px;
    /* background-color: pink; */
}
.service li h5 {
    margin-right: 20px;
    width: 58px;
    height: 58px;
    background-image: url(../images/sprite.png);
}
.service li:nth-child(2) h5 {
    background-position: 0 -58px;
}
.service li:nth-child(3) h5 {
    background-position: 0 -116px;
}
.service li:nth-child(4) h5 {
    background-position: 0 -174px;
}
.service li p {
    font-size: 28px;
    line-height: 58px;
}
/* 帮助中心 */
.help {
    display: flex;
    justify-content: space-between;
    padding-top: 60px;
    height: 300px;
}
.help .left {
    display: flex;
}
.help .left dl {
    margin-right: 84px;
}
.help .left dl:last-child {
    margin-right: 0;
}
.help .left dt {
    margin-bottom: 30px;
    font-size: 18px;
}
.help .left dd {
    margin-bottom: 10px;
}
.help .left dd a {
    color: #969696;
}
.help .left .iconfont {
    color: #5EB69C;
}

.help .right ul {
    display: flex;
}
.help .right li:first-child {
    margin-right: 55px;
}
.help .right .pic {
    margin-bottom: 10px;
    width: 120px;
    height: 120px;
}
.help .right p {
    color: #969696;
    text-align: center;
}

.coopright {
    text-align: center;
    margin-bottom: 40px;
}
.coopright p {
    margin-bottom: 10px;
    color: #A1A1A1;
}
.coopright p a {
    color: #A1A1A1;
    margin: 0 10px;
}

index

/* banner */
.banner {
    height: 500px;
    background-color: #f5f5f5;
}
.banner .wrapper {
    height: 500px;
    background-color: pink;
    overflow: hidden;
    position: relative;
}
.banner .wrapper .pic {
    display: flex;
    /* flex布局,父级宽度不够,增大父级尺寸 */
    width: 3720px;
}
/* 侧导航 */
.subnav {
    position: absolute;
    left: 0;
    top: 0;
    width: 250px;
    height: 500px;
    background-color: rgba(0, 0, 0, 0.42);
}
.subnav li {
    display: flex;
    justify-content: space-between;
    height: 50px;
    /* background-color: pink; */
    line-height: 50px;
    padding-left: 30px;
    padding-right: 12px;
    color: #fff;
    cursor: pointer;
}
.subnav li a {
    font-size: 14px;
    margin-right: 14px;
    color: #fff;
}
.subnav li .classify {
    font-size: 16px;
    margin-right: 14px;
}
.subnav li .iconfont {
    font-size: 14px;
}
.subnav li:hover {
    background-color: #00eb9a;
}
/* 原点解释器 */
.banner ol {
    display: flex;
    position: absolute;
    bottom: 17px;
    right: 16px;
}
.banner ol li {
    width: 22px;
    height: 22px;
    /* background-color: pink; */
    border-radius: 50%;
    margin-left: 8px;
}
.banner ol i {
    margin: 4px;
    display: block;
    width: 14px;
    height: 14px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
}
.banner ol .activate{
    background-color: rgba(255, 255, 255, 0.5);
}
.banner ol .activate i {
    background-color: #fff;
}
.title {
    height: 42px;
    margin-top: 40px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
}
.title .left {
    display: flex;
}
.title .left h3 {
    font-size: 30px;
    margin-right: 35px;
}
.title .left p {
    align-self: flex-end;
    color: #a1a1a1;
}
.title .right a {
    line-height: 42px;
    color: #a1a1a1;
}
.title .right .iconfont {
    margin-left: 10px;
}
.bd ul {
    justify-content: space-between;
    display: flex;
}
.bd ul li {
    background-color: #EEF9F4;
    width: 304px;
    height: 404px;
}
.bd li .pic {
    width: 304px;
    height: 304px;
}
.bd li .txt {
    text-align: center;
}
.bd li .txt h4 {
    margin-top: 18px;
    margin-bottom: 8px;
    font-size: 20px;
}
.goods .bd li .txt p {
    color: red;
    font-size: 18px;
    margin-right: 3px;
}
.goods li .txt p span {
    font-size: 22px;
    margin-left: 3px;
}
.recommend .bd li {
    background-color: #fff;
}
.recommend .bd p {
    color: #a1a1a1;
}
/* 热门品牌 */
.brand {
    margin-top: 60px;
    height: 468px;
    background-color: #f5f5f5;
}
.brand .wrapper {
    overflow: hidden;
    height: 468px;
    /* background-color: pink; */
}
.brand .title {
    position: relative;
    margin-bottom: 40px;
}
.brand .button {
    position: absolute;
    right: 0;
    bottom: -25px;
    display: flex;
}
.brand .button a {
    margin-left: 12px;
    width: 20px;
    height: 20px;
    text-align: center;
    line-height: 20px;
    color: #fff;
}
.brand .button .prev {
    background-color: #ddd;
}
.brand .button .next {
    background-color: #00eb9a;
}
.brand .bd li {
    width: 244px;
    height: 306px;
}

/* 生鲜 */
.fresh .title {
    margin-top: 60px;
    margin-bottom: 20px;
}
.title .right {
    display: flex;
}
.title .right ul {
    display: flex;
    margin-top: 10px;
    margin-right: 58px;
}
.title .right ul li a {
    margin-left: 6px;
    height: 20px;
    padding: 0 7px;
    line-height: 20px;
    display: block;
    /* background-color: pink; */
    color: #333;
}
.title .right ul li .active {
    background-color: #00eb9a;
    color: #fff;
}
/* 生鲜内容 */
.content {
    display: flex;
    justify-content: space-between;
}
.content .left {
    width: 248px;
    height: 610px;
    /* background-color: pink; */
}
.content .right {
    width: 968px;
    height: 610px;
    /* background-color: pink; */
}
.content .right ul {
    display: flex;
    flex-wrap: wrap;
}
.content .right li {
    width: 242px;
    height: 305px;
    border: 2px solid skyblue;
    padding: 10px 21px 0;
}
.content .right .pic {
    width: 200px;
    height: 180px;
}
.content .right .txt .info {
    height: 60px;
    margin-top: 14px;
    margin-bottom: 5px;
    line-height: 19px;
}
.content .right .txt .price {
    color: #AF2f22;
}
.content .right .txt .price span {
    font-size: 22px;
    margin-left: 5px;
}


代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- meta:desc -->
    <meta name="description" content="小奶鲜儿直网,致力于打透全球最大的食品、生解电商购物平台">
    <!-- meta:kw -->
    <meta name="keywords" content="小免鲜儿食品.生解,服装家电,电商,购物">
    <title>小兔鲜儿-新鲜、惠民、快捷!</title>
    <!-- link:fa -->
    <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
    <link rel="stylesheet" href="./iconfont/iconfont.css">
    <link rel="stylesheet" href="css/base.css">
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/index.css">
</head>
<body>
    <!-- 快捷导航 -->
    <div class="shortcut">
        <div class="wrapper">
            <ul>
                <li><a href="#" style="color: aquamarine;">请先登录</a></li>
                <li><a href="#">请先登录</a></li>
                <li><a href="#">请先登录</a></li>
                <li><a href="#">请先登录</a></li>
                <li><a href="#">请先登录</a></li>
                <li><a href="#">请先登录</a></li>
                <li><a href="#"><span class="iconfont icon-mobile-phone" ></span>请先登录</a></li>
            </ul>
        </div>
    </div>
    <!-- 头部 -->
    <div class="header wrapper">
        <!-- logo -->
        <div class="logo">
            <h1><a href="#">小兔仙儿</a></h1>
        </div>
        <!-- 导航 -->
        <div class="nav">
            <ul>
                <li><a href="#" class="active">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
                <li><a href="#">首页</a></li>
            </ul>
        </div>
        <!-- 搜索 -->
        <div class="search">
            <span class="iconfont icon-search"></span>
            <input type="text" placeholder="搜一搜">
        </div>
        <!-- 购物车 -->
        <div class="cart">
            <span class="iconfont icon-cart-full"></span>
            <i>2</i>
        </div>
    </div>
    <!-- 结构:通栏>版心>轮播图 (ulpic)+侧导航 (subnav > ul) + 圆点指示器 (ol) -->
    <!-- banner -->
    <div class="banner">
        <div class="wrapper">
            <!-- 图片 -->
            <ul class="pic">
                <li><a href="#"><img src="./uploads/banner1.png" alt=""></a></li>
                <li><a href="#"><img src="./uploads/banner1.png" alt=""></a></li>
                <li><a href="#"><img src="./uploads/banner1.png" alt=""></a></li>
            </ul>
            <!-- 侧导航 -->
            <div class="subnav">
                <ul>
                    <li>
                        <div><a href="#" class="classify">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                    <li>
                        <div><a href="#">生鲜</a><a href="#">水果</a><a href="#">蔬菜</a></div>
                        <span class="iconfont icon-arrow-right-bold"></span>
                    </li>
                </ul>
            </div>
            <!-- 原点指示器 -->
            <ol>
                <li class="activate"><i></i></li>
                <li><i></i></li>
                <li><i></i></li>
            </ol>
        </div>
    </div>
    <!-- 新鲜好物 -->
    <div class="goods wrapper">
        <!-- 标题 -->
        <div class="title">
            <div class="left">
                <h3>新鲜好物</h3>
                <p>新鲜出炉 品质保证</p>
            </div>
            <div class="right">
                <a href="#">查看全部<span  class="iconfont icon-arrow-right-bold"></span></a>
            </div>
        </div>
        <!-- 内容 -->
        <div class="bd">
            <ul>
                <li>
                    <a href="#">
                        <div class="pic">
                            <img src="./uploads/goods1.png" alt="">
                        </div>
                        <div class="txt">
                            <h4>KN95级莫兰油色防护口罩</h4>
                            <p>$<span>79</span></p>
                        </div>
                    </a>
                </li>
                <li>
                    <a href="#">
                        <div class="pic">
                            <img src="./uploads/goods1.png" alt="">
                        </div>
                        <div class="txt">
                            <h4>KN95级莫兰油色防护口罩</h4>
                            <p>$<span>79</span></p>
                        </div>
                    </a>
                </li>
                <li>
                    <a href="#">
                        <div class="pic">
                            <img src="./uploads/goods1.png" alt="">
                        </div>
                        <div class="txt">
                            <h4>KN95级莫兰油色防护口罩</h4>
                            <p>$<span>79</span></p>
                        </div>
                    </a>
                </li>
                <li>
                    <a href="#">
                        <div class="pic">
                            <img src="./uploads/goods1.png" alt="">
                        </div>
                        <div class="txt">
                            <h4>KN95级莫兰油色防护口罩</h4>
                            <p>$<span>79</span></p>
                        </div>
                    </a>
                </li>
            </ul>
        </div>
    </div>
    <!-- 人气推荐 -->
    <div class="recommend wrapper">
        <!-- 标题 -->
        <div class="title">
            <div class="left">
                <h3>人气推荐</h3>
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### 黑马程序员 HTML 和 CSS Day 14 案例 #### 表单验证与提交处理 在第十四天的学习中,重点在于表单的高级应用和交互效果。通过使用 JavaScript 结合 HTML 和 CSS 来增强用户体验。 ```html <form id="registrationForm"> <div> <!-- 使用 label 标签关联输入框 --> <label for="username">用户名:</label> <input type="text" name="username" required /> </div> <div> <label for="password">密码:</label> <input type="password" name="password" pattern=".{6,}" title="至少六个字符" required /> </div> <button type="submit">注册</button> </form> ``` 为了确保用户填写的信息有效,在 `<form>` 中加入了 `required` 属性来防止空白提交,并利用 `pattern` 对特定字段设置正则表达式的约束条件[^5]。 #### 动态样式调整 当页面加载完成或者发生某些事件时,可以通过JavaScript动态改变元素的样式: ```javascript document.getElementById('registrationForm').addEventListener('submit', function(event){ event.preventDefault(); // 阻止默认行为 const form = this; if (validateForm(form)) { document.querySelector('.success-message').style.display = 'block'; setTimeout(() => { form.reset(); document.querySelector('.success-message').style.display = 'none'; }, 3000); } }); function validateForm(form) { let isValid = true; Array.from(form.elements).forEach(element => { if (!element.checkValidity()) { element.classList.add('invalid'); isValid = false; } else { element.classList.remove('invalid'); } }); return isValid; } ``` 这段脚本会在点击按钮前先做一次简单的客户端校验,如果成功,则显示一条成功的消息并重置表单;如果有任何错误,则给相应的输入项加上 `.invalid` 类以便于视觉反馈[^2]。 #### 自定义伪类选择器的应用 对于更复杂的UI需求,可以自定义一些CSS伪类来进行特殊状态下的样式控制: ```css /* 定义全局变量 */ :root { --primary-color: #ff8a80; } /* 当鼠标悬停在版权信息上的链接时变色 */ .copyright a:hover { color: var(--primary-color); } .invalid { border-color: red !important; box-shadow: 0 0 5px rgba(255, 0, 0, .7); } ``` 这里不仅实现了基本的功能性操作,还考虑到了美观性和易用性的提升[^3]。
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