有效沟通问答-【官方】百战程序员_IT在线教育培训机构

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .nav{
            width: 100%;
            height: 60px;
            background-color: black;
        }

        .nav ul{
            overflow: hidden;
            clear: both;
        }

        .nav ul li{
            list-style: none;
            float: left;
            padding: 20px 25px;
        }

        .nav ul li a{
            color: aqua;
            text-decoration: none;
            font-size: 30px;
        }
        .box{
            width: 100%;
            height: 300px;
            position: absolute;
            left: 0%;
            display:none;
        }

        .nav li:hover>.box{
            display: block;
        }


    </style>

</head>
<body>
   
    <div class="nav">
        <ul>
            <li><a href="#">首页</a>    
            <div class="box" style="background-color: red;"></div><!--这个就是下拉列代表的容器-->
        </li>
            <li><a href="#">手机</a>    
            <div class="box" style="background-color: gold;"></div>
        </li>


            <li><a href="#">配件</a>    
            <div class="box" style="background-color: green;"></div>
        </li>

            <li><a href="#">电脑</a>    
            <div class="box" style="background-color: blanchedalmond;"></div>
        </li>
            <li><a href="#">手表</a>    
            <div class="box" style="background-color: blue;"></div>
        </li>
        </ul>
    </div>

</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/浮动与定位 92楼

老师，submit那里的value是可以不用写对吗

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 93楼

老师，为什么我的显示的提示是这句话

我是这样写的

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 94楼

视频中为什么要加bottom？

不是没有position属性吗。

WEB前端全系列/第一阶段：HTML5+CSS3模块/浮动与定位 95楼

span标签不是行内元素吗，为啥还设置宽高？

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS选择器 96楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
  <style>
.box{
    width: 200px;
    height: 200px;
    background: red;
    padding: 50px;
    border:20px solid green;
    margin: 50px;
    box-sizing: border-box;
}

  </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS盒子模型 97楼

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .square {
            width: 400px;
            height: 400px;
        }
        .left{
            float: left;
            width: 200px;
            height:200px;
            background-color: cyan;
        }
        .right {
            float: left;
            width: 200px;
            height: 400px;
            background-color: chocolate;
        }
        .top {
            width: 200px;
            height: 200px;
            background-color: antiquewhite;
        }

        .bottom {
            width: 200px;
            height: 200px;
            background-color: aquamarine;
        }

       
    </style>

</head>

<body>

    <div class="square">
        <div class="left">
            <div class="top"></div>
            <div class="bottom"></div>
        </div>
        <div class="right"></div>
    </div>
   
   

</body>

</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/初识CSS 98楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .square{
            width: 600px;
            height: 600px;
            background-color: antiquewhite;
        }
        .left{
            float: left;
            width: 200px;
            height: 600px;
            background-color: pink;
        }
        .right{
            float: right;
            width: 400px;
            height: 600px;
            background-color: green;
        }
        .top{
            width: 400px;
            height: 300px;
            background-color: springgreen;
        }
        .zuo{
            float: left;
            width: 200px;
            height: 300px;
            background-color: blue;
        }
        .you{
            float: right;
            width: 200px;
            height: 300px;
            background-color: chocolate;
        }
    </style>

</head>
<body>
   
    <div class="square">
        <div class="left"></div>
        <div class="right">
            <div class="top"></div>
            <div class="bottom">
                <div class="zuo"></div>
                <div class="you"></div>
            </div>
        </div>
    </div>

</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/初识CSS 99楼

这个注释标签

中间必须要有空格吗？

WEB前端全系列/第一阶段：HTML5+CSS3模块/前端入门与基础知识 100楼

比如说“你好，很高兴见到你”这段话，我想要加粗的同时增加斜体效果，标签要如何使用

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5基础元素 101楼

和楼下一样的问题，我们找的图片大小太大了。

刚才在csdn上面搜索了半天，也没找到解决方案。

就是列表的前面图片我们找的素材太大了。如何通过代码调整图片大小

问题和楼下的问题是一模一样的。如何解决呢？

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS常用属性 102楼

刚才通过实操作业。

发现把大容器宽度和高度都设置为实参。

里面的子容器宽度和高度都设置为%百分比形式的形式参数。

结论：

貌似发现了新世界，感觉后期如果维护的话。只需要修改外面大容器的实际参数值。就好了

毕竟内部的一些参数因为全部都是百分比形式输入的。所以内部布局都会跟着外部布局去变化。

WEB前端全系列/第一阶段：HTML5+CSS3模块/初识CSS 103楼

这里是不是写错了，最后怎么是margin，不是padding么

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS盒子模型 104楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>小米</title>
    <link rel="stylesheet" href="./css/reset.css">
    <link rel="stylesheet" href="./css/mi.css">
    <link rel="stylesheet" href="./css/iconfont/iconfont.css">
</head>
<body>

    <!-- 头部开始 -->
    <div class="header">
        <a href="#">
            <img src="./images/top.jpg" alt="">
        </a>
    </div>
    <!-- 头部结束 -->
    <!-- 黑色导航部分开始 -->
    <!-- 
        黑色导航实现步骤：
            1. 主容器，背景黑色
            2. 内容部分居中显示，容器处理
            3. 左导航和右导航
            4. 动画
     -->
    <div class="black-nav">
        <div class="wrap">
            <ul class="black-nav-left">
                <li><a href="#">小米商城</a><span>|</span></li>
                <li><a href="#">MIUI</a><span>|</span></li>
                <li><a href="#">loT</a><span>|</span></li>
                <li><a href="#">云服务</a><span>|</span></li>
                <li><a href="#">天星数科</a><span>|</span></li>
                <li><a href="#">有品</a><span>|</span></li>
                <li><a href="#">小爱开放平台</a><span>|</span></li>
                <li><a href="#">企业团购</a><span>|</span></li>
                <li><a href="#">资质证照</a><span>|</span></li>
                <li><a href="#">协议规则</a><span>|</span></li>
                <li>
                    <a href="#">下载APP</a>
                    <span>|</span>
                    <div class="download">
                        <img src="./images/download.png" alt="">
                        <p>小米商城APP</p>
                    </div>
                    <div class="stri"></div>
                </li>
                <li><a href="#">智能生活</a><span>|</span></li>
                <li><a href="#">SelectLocation</a><span>|</span></li>
            </ul>
            <ul class="black-nav-right">
                <li><a href="#">登录</a><span>|</span></li>
                <li><a href="#">注册</a><span>|</span></li>
                <li><a href="#">消息通知</a><span>|</span></li>
                <li class="cart">
                    <a href="#">
                        <i class="iconfont">&#xe607;</i>
                        <i>购物车（0）</i>
                    </a>
                    <div class="cart-list">
                        购物车中还没有商品，赶紧选购吧
                    </div>
                </li>
            </ul>
        </div>
    </div>
    <!-- 黑色导航部分结束 -->
    <!-- 白色导航开始 -->
    <div class="white-nav">
        <div class="wrap">
            <div class="logo">
                <img src="./images/mi-home.png" alt="" class="mi-home">
                <img src="./images/mi-logo.png" alt="" class="mi-logo">
            </div>
            <div class="nav-bar">
                <ul>
                    <li><a href="#"><img src="./images/zzxsh.gif" alt=""></a></li>
                    <li>
                        <a href="#">小米手机</a>
                        <div class="nav-bar-list">
                            <div class="wrap">
                                <ul>
                                    <li>
                                        <a href="#">
                                            <div class="img-box">
                                                <img src="./images/phone.png" alt="">
                                            </div>
                                            <p class="name">小米10至尊纪念版</p>
                                            <p class="price">5200元</p>
                                        </a>
                                    </li>
                                    <li>
                                        <a href="#">
                                            <div class="img-box">
                                                <img src="./images/phone.png" alt="">
                                            </div>
                                            <p class="name">小米10至尊纪念版</p>
                                            <p class="price">5200元</p>
                                        </a>
                                    </li>
                                    <li>
                                        <a href="#">
                                            <div class="img-box">
                                                <img src="./images/phone.png" alt="">
                                            </div>
                                            <p class="name">小米10至尊纪念版</p>
                                            <p class="price">5200元</p>
                                        </a>
                                    </li>
                                    <li>
                                        <a href="#">
                                            <div class="img-box">
                                                <img src="./images/phone.png" alt="">
                                            </div>
                                            <p class="name">小米10至尊纪念版</p>
                                            <p class="price">5200元</p>
                                        </a>
                                    </li>
                                </ul>
                            </div>
                        </div>
                    </li>
                    <li><a href="#">电视</a></li>
                    <li><a href="#">笔记本</a></li>
                    <li><a href="#">家电</a></li>
                    <li><a href="#">路由器</a></li>
                    <li><a href="#">智能硬件</a></li>
                    <li><a href="#">服务</a></li>
                    <li><a href="#">社区</a></li>
                </ul>
            </div>
            <div class="search">
                <input type="text" placeholder="元宇宙">
                <button class="iconfont">&#xe63d;</button>
            </div> 
        </div>
    </div>
    <!-- 白色导航结束 -->
   
</body>
</html>
老师为什么白色导航下居中不了啊，还有黑色导航

WEB前端全系列/第一阶段：HTML5+CSS3模块/商城官网项目 105楼

同学您好