老师为什么footer区域文字居中不了？
来源：5-6 作业题
陈立天
2020-02-15 18:12:45
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>JS实战</title> <link rel="stylesheet" type="text/css" href="./css/index.css" /> <link rel="stylesheet" type="text/css" href="./css/base.css" /> <script src="./JS/index.js"></script> </head> <body> <!-- 头部 --> <header> <div class="header__logo">H5实战页面</div> <div class="header__nava"> <!-- 导航项 --> <a href="javascript:;" class="header__nava-item header__nava-item_custom_ative">实战课程</a> <a href="javascript:;" class="header__nava-item">商业案例</a> <a href="javascript:;" class="header__nava-item">课程体系</a> <a href="javascript:;" class="header__nava-item">集成环境</a> <a href="javascript:;" class="header__nava-item">云端学习</a> <!-- 导航项按钮 --> <a href="javascript:;" class="header__nava-item header__nava-item_custom_buttom">即刻学习</a> </div> </header> <!-- 屏幕1 --> <div class="screan1"> <!-- 屏幕1标题1 --> <h2 class="screan1__heading">实战课程重磅上线</h2> <!-- 屏幕2标题2 --> <h4 class="screan1__subheading">一键云学习，还在等什么？</h4> </div> <!-- 屏幕2 --> <div class="screan2"> <!-- 网页内容容器 --> <div class="screan__wrap"> <!-- 屏幕2标题1 --> <h2 class="screan2__wrap__heading">每门课都是真实商业案例</h2> <!-- 屏幕2标题2 --> <h5 class="screan2__wrap__subheading">真实案例，真实场景,在实战中实践、操作调试<br>大牛带你体验BAT真实开发流程，所有开发过程一一为你呈现</h5> <!-- 屏幕2图片项 --> <div class="screan2__warp_img-item"> <div class="screan2__wrap__img-item__bg-1"></div> <div class="screan2__wrap__img-item__bg-2"></div> <div class="screan2__wrap__img-item__bg-3"></div> </div> </div> </div> <!-- 屏幕3 --> <div class="screan3"> <!-- 容器 --> <div class="screan__wrap"> <!-- 屏幕3图片 --> <div class="screan3__img__bg-1"></div> <!-- 屏幕3标题1 --> <h2 class="screan3__heding">强大的语言课程体系支持</h2> <!-- 屏幕3标题2 --> <h3 class="screan3__subheding">学习环境与课程轻松对接，安装、调试、写入、部署、运行，一站式解决<br>，让你体验开发流程</h3> </div> </div> <!-- 屏幕4 --> <div class="screan4"> <div class="screan__wrap"> <h2 class="screan4__wrap__heading">省去本地复杂的环境搭建</h2> <div class="screan4__wrap__heading__line"></div> <h3 class="screan4__wrap__subheading">你可以告别在虚拟机中调试开发了</h3> <div class="screan4__wrap__img"> <div class="screan4__wrap__img__bg-1"></div> <div class="screan4__wrap__img__bg-2"></div> <div class="screan4__wrap__img__bg-3"></div> <div class="screan4__wrap__img__bg-4"></div> <h4 class="screan4__wrap__img__bg-1__inner-1">实战课程集成开发环境</h4> <h4 class="screan4__wrap__img__bg-2__inner-2">内置终端命令行</h4> <h4 class="screan4__wrap__img__bg-3__inner-3">编译你的应用程序</h4> <h4 class="screan4__wrap__img__bg-4__inner-4">通过云端服务输出效果</h4> </div> </div> </div> <!-- 屏幕5 --> <div class="screan5"> <div class="screan__wrap"> <div class="screan5__wrap__img__bg-1"></div> <h2 class="screan5__wrap__heading">云端学习可以这样简单</h2> <h3 class="screan5__wrap__subheading">看视频，敲代码一气呵成。结合慕课网为你提供的云端学习工具，所见即所得。从此学习不一样</h3> </div> </div> <!-- 屏幕6 --> <div class="screan6"> </div> <!-- 页脚 --> <footer> <div class="screan__wrap"> <div class="footer__heading"> <p>首页网站</p><p>人才招聘</p><p>联系我们</p><p>高校联盟</p><p>关于我们</p><p>讲师招募</p><p>意见反馈</p><p>友情链接</p> </div> <div class="footer__subheading"> <p>copyright ©2015 imooc.com All Rights Reserved | 京ICP备 13046642号-2</p> </div> </div> </footer> </body> </html>
/* 头部 */
header{
height:60px;
width: 100%;
position: fixed;
top: 0;
left: 0;
z-index: 999;
}
/* 头部logo */
.header__logo{
height: 40px;
background-color:rgba(128,128,128, 0.1);
font-size: 18px;
background: url(../img/logo.png)no-repeat;
font-weight: bold;
color: white;
z-index: 99;
text-indent: 60px;
line-height: 40px;
float: left;
margin-left:10px;
margin-top: 10px;
}
/* 网页内容容器 */
.screan__wrap{
width: 1200px;
height: 640px;
margin: 0 auto;
}
/* 头部导航 */
.header__nava{
float: right;
display: block;
line-height: 60px;
height: 40px;
}
/* 头部导航项 */
.header__nava-item{
color: #efefff;
margin-right: 40px;
cursor:pointer;
}
/* 头部导航按钮 */
.header__nava-item_custom_buttom{
border-radius: 5px;
height:40px;
width: 96px;
background-color: #f01400;
color: #efefff;
display: block;
float:right;
margin-top: 10px;
line-height: 40px;
margin-right: 30px;
text-align: center;
}
/* 屏幕1 */
.screan1{
height: 640px;
width: 100%;
background:url(../img/sc1.jpg)no-repeat;
background-size: cover;
display: block;
position: relative;
}
/* 屏幕1标题1 */
.screan1__heading{
position: absolute;
font-size:40px;
font-weight: bold;
color:#ffff;
display: block;
padding-top:240px;
text-align: center;
float: left;
width: 100%;
}
/* 屏幕1标题2 */
.screan1__subheading{
position: absolute;
color:#ffff;
display: block;
padding-top:315px;
text-align: center;
float: left;
width: 100%;
}
/* 屏幕2 */
.screan2{
width: 100%;
height:640px;
height: 640px;
width: 100%;
background-size: cover;
display: block;
position: relative;
overflow: hidden;
}
/* 屏幕2标题1 */
.screan2__wrap__heading{
color:#07111b;
font-size: 40px;
text-align: center;
margin: 0;
line-height: 40px;
padding-top: 90px;
}
/* 屏幕2标题2 */
.screan2__wrap__subheading{
line-height: 16px;
color:#07111b;
font-size: 16px;
text-align: center;
margin: 0;
line-height: 28px;
padding-top: 63px;
}
/* 屏幕2 图片项 */
.screan2__warp__img-item{
width: 100%;
height:391px;
display: block;
float: left;
overflow: hidden;
margin: 0 auto;
}
/* 屏幕2 图片项1 */
.screan2__wrap__img-item__bg-1{
display: block;
position: absolute;
float: left;
background: url(../img/sc2.png)no-repeat;
height: 361px;
width: 750px;
z-index: 1;
color:red;
margin-left: 225px;
margin-top: 42px;
}
/* 屏幕2 图片项2 */
.screan2__wrap__img-item__bg-2{
display: block;
position: absolute;
float: left;
background: url(../img/sc2-1.png)no-repeat;
height: 380px;
width: 275px;
z-index: 99;
margin-left: 462.5px;
margin-top: 20px;
}
/* 屏幕2 图片项3 */
.screan2__wrap__img-item__bg-3{
display: block;
position: absolute;
float: left;
background: url(../img/sc2-2.png)no-repeat;
height: 305px;
width: 266px;
margin-left: 580px;
margin-top: 103px;
z-index: 3;
}
/* 屏幕3 */
.screan3{
position: absolute;
float: left;
width: 100%;
height:640px;
height: 640px;
width: 100%;
background-size: cover;
display: block;
position: relative;
background-color:#2b333b;
overflow: hidden;
}
/* 屏幕3图片 */
.screan3__img__bg-1{
display: block;
position: absolute;
float: left;
background: url(../img/sc3.png)no-repeat;
height: 340px;
width: 308px;
margin-left: -80px;
margin-top: 150px;
z-index: 3;
transform: scale(1.85);
}
/* 屏幕3标题1 */
.screan3__heding{
font-size:35px;
color: #ffff;
padding-left: 665px;
padding-top:230px;
}
/* 屏幕3标题2 */
.screan3__subheding{
font-size:15px;
color: #ffff;
margin-left: 665px;
line-height: 25px;
padding-top:58px;
}
/* 屏幕4 */
.screan4{
position: absolute;
float: left;
width: 100%;
height:640px;
height: 640px;
width: 100%;
background-size: cover;
display: block;
position: relative;
background-color:#f3f5f7;
overflow: hidden;
}
.screan4__wrap__heading{
color: #07111b;
font-size: 40px;
text-align: center;
padding-top:90px;
}
.screan4__wrap__heading__line{
border-bottom: ;
}
.screan4__wrap__subheading{
color: #07111b;
font-size: 16px;
text-align: center;
padding-top:63px;
}
.screan4__wrap__img{
display: block;
height:100%;
width: 100%;
margin: 0 auto;
}
.screan4__wrap__img__bg-1{
background: url(../img/sc4-1.png)no-repeat;
margin-top: 80px;
margin-left: 100px;
margin-right: 220px;
width: 80px;
height: 70px;
display: block;
float: left;
}
.screan4__wrap__img__bg-2{
background: url(../img/sc4-2.png)no-repeat;
margin-right: 220px;
margin-top: 80px;
width: 80px;
height:75px;
display: block;
float: left;
}
.screan4__wrap__img__bg-3{
background: url(../img/sc4-3.png)no-repeat;
margin-right: 220px;
margin-top: 80px;
width: 80px;
height:75px;
display: block;
float: left;
}
.screan4__wrap__img__bg-4{
background: url(../img/sc4-4.png)no-repeat;
margin-top: 80px;
width: 80px;
height:80px;
display: block;
float: left;
}
.screan4__wrap__img__bg-1__inner-1{
height: 16px;
margin-top: 30px;
padding-left:60px;
font-size: 16px;
line-height: 16px;
float: left;
color: #07111b;
}
.screan4__wrap__img__bg-2__inner-2{
height: 16px;
margin-top: 30px;
padding-left:160px;
font-size: 16px;
line-height: 16px;
float: left;
color: #07111b;
}
.screan4__wrap__img__bg-3__inner-3{
height: 16px;
margin-top: 30px;
padding-left:180px;
font-size: 16px;
line-height: 16px;
float: left;
color: #07111b;
}
.screan4__wrap__img__bg-4__inner-4{
height: 16px;
margin-top: 30px;
padding-left:160px;
font-size: 16px;
line-height: 16px;
float: left;
color: #07111b;
}
/* 屏幕5 */
.screan5{
position: absolute;
float: left;
width: 100%;
height:640px;
height: 640px;
width: 100%;
display: block;
position: relative;
background: url(../img/sc5.jpg)no-repeat;
background-size: cover;
overflow: hidden;
}
.screan5__wrap__img__bg-1{
background: url(../img/sc5-1.png)no-repeat;
width: 200px;
height: 200px;
margin-left: 496px;
margin-top: 100px;
}
.screan5__wrap__heading{
color: #ffffff;
font-size: 40px;
text-align: center;
padding-top:90px;
}
.screan5__wrap__subheading{
color: #ffffff;
font-size: 16px;
text-align: center;
padding-top:64px;
}
/* 屏幕6 */
.screan6{
position: absolute;
float: left;
width: 100%;
height:200px;
height: 640px;
width: 100%;
background-size: cover;
display: block;
position: relative;
background-color:#ffff;
overflow: hidden;
}
/* 页脚 */
footer{
position: absolute;
float: left;
width: 100%;
height:200px;
height: 105px;
width: 100%;
background-size: cover;
display: block;
position: relative;
background-color:#000000;
overflow: hidden;
}
footer p{
margin-right: 40px;
color: #ffffff;
font-size: 11px;
float: left;
display: block;
}
.footer__heading{
margin-top: 33px;
margin-left: 270px;
width: 100%;
height:15px;
}
.footer__subheading{
padding-top: 13px;
height:20px;
text-align: center;
}
.footer__subheading p{
font-size: 12px;
color: #ffffff;
text-align: center;
}*{
margin:0;
padding:0;
font-size:12px;
font-family: "Microsoft Yahei";
}
a{
text-decoration: none;
}老师footer的p标签的内容 包括版权哪里，都居中不了是什么原因，我给“人才招聘”那一块是用左边填充达到居中效果，感觉不太好？
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1回答
-
好帮手慕夭夭
2020-02-15
同学你好，这是因为设置了浮动的影响，所以内容脱离文档流，往左浮动了。
建议如下修改：
链接建议使用a标签更好, 且a是行内元素，可以使用文本居中属性
去掉p的样式 ，改为给a设置样式：
另外，代码中给一个元素设置两个定位，那么后面的会覆盖前面的。还有其他的样式，如宽高也重复设置了，练习时要认真哦：
建议如下注释的去掉：
如果我的回答帮助到了你，欢迎采纳，祝学习愉快~
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