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CSS定位与浮动及经典三列布局

Dobeen
Dobeen原创
2020年06月19日 11:52:43467浏览

演示图

代码

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8">
  5. <title>布局练习</title>
  6. <style>
  7. /* 初始化 */
  8. * { padding: 0; margin: 0; box-sizing: border-box; font-size: 14px; }
  9. body { background-color: #f3f5f7; }
  10. li { list-style: none; }
  11. a { text-decoration: none; }
  12. .clear { zoom: 1; }
  13. .clear:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; }
  14. /* 初始化 */
  15. /* 头部样式 */
  16. .header { position: relative; background-color: #000; }
  17. .header .logo { position: absolute; top: 0; left: 20px; height: 60px; width: 140px; background: url(https://www.php.cn/static/images/logo.png) no-repeat center center; background-size: 100%; }
  18. .nav { padding-left: 180px; }
  19. .guest-box { float: right; }
  20. .header li { float: left; }
  21. .nav > li { margin: 0 10px; position: relative; }
  22. .nav > li a, .guest-box > li a { display: inline-block; height: 60px; line-height: 60px; color: #bbb; padding: 0 20px; }
  23. .nav > li a:hover, .guest-box > li a:hover { color: #FFF; }
  24. .subnav { position: absolute; width: 222px; border: 1px solid #d2d2d2; top: 60px; display: none; background-color: #FFF; }
  25. .subnav > li a { color: #333; display: block; width: 110px; height: 40px; line-height: 40px; }
  26. .subnav > li a:hover { color: #333; background-color: #f2f2f2; }
  27. .navbar { position: absolute; left: 0; bottom: 0; width: 100px; height: 5px; background-color: #00a700; }
  28. /* 头部样式 */
  29. /* 内容区域样式 */
  30. .adbox { width: 1200px; margin: 20px auto; }
  31. .adbox img { border-radius: 8px; }
  32. .content { width: 1200px; margin: auto; position: relative; }
  33. .content > .left { position: absolute; top: 0; left: 0; width: 300px; }
  34. .content > .right { position: absolute; top: 0; right: 0; width: 260px; }
  35. .content > .middle { margin-left: 310px; margin-right: 270px; }
  36. /* 栏目框样式 */
  37. .content-box { height: 420px; width: 100%; background-color: #FFF; border-radius: 8px; }
  38. .content-box .box-head { margin: 0 15px; border-bottom: 1px dotted #e9e9e9; padding: 8px 5px; font-weight: bolder; }
  39. .toutiaolist { padding: 15px; }
  40. .toutiaolist li { height: 30px; line-height: 30px; }
  41. .toutiaolist li a { color: #333; }
  42. .courselist li { float: left; width: 33.333%; margin-top: 20px; }
  43. .courselist li .course { width: 180px; height: 160px; margin: auto; border-radius: 8px; box-shadow: 0 5px 10px 0 rgba(0,0,0,0.1); font-size: 30px; text-align: center; line-height: 160px; }
  44. .shouce { padding: 0 15px 0 15px;}
  45. .shouce li { position: relative; margin-top: 20px; }
  46. .shouce li img { position: absolute; top: 0; left: 0; width: 45px; height: 45px; }
  47. .shouce li a { display: block; color: #333; margin-left: 55px; font-size: 13px; line-height: 20px; }
  48. .footer { background-color: #393D49; color: #787d82; position: fixed; bottom: 0; width: 100%; padding: 15px 0; }
  49. .footer p { height: 30px; line-height: 30px; font-size: 12px; text-align: center; }
  50. </style>
  51. </head>
  52. <body>
  53. <div class="header clear">
  54. <a href="http://php.cn" class="logo"></a>
  55. <ul class="nav">
  56. <li><a href="#">首页</a></li>
  57. <li><a href="#">视频教程</a></li>
  58. <li><a href="#">入门教程</a></li>
  59. <li><a href="#">社区问答</a></li>
  60. <li>
  61. <a href="#">技术文章</a>
  62. <ul class="subnav clear">
  63. <li><a href="#">头条</a></li>
  64. <li><a href="#">博客</a></li>
  65. <li><a href="#">PHP教程</a></li>
  66. <li><a href="#">JS教程</a></li>
  67. <li><a href="#">Mysql教程</a></li>
  68. <li><a href="#">PHP框架</a></li>
  69. </ul>
  70. </li>
  71. <li><a href="#">资源下载</a></li>
  72. <li><a href="#">编程词典</a></li>
  73. <li><a href="#">工具下载</a></li>
  74. <li><a href="#">PHP培训</a></li>
  75. </ul>
  76. <ul class="guest-box">
  77. <li><a href="#">登录</a></li>
  78. <li><a href="#">注册</a></li>
  79. </ul>
  80. </div>
  81. <div class="container">
  82. <div class="adbox">
  83. <a href="https://www.php.cn/toutiao-387072.html" target="_blank"><img src="https://www.php.cn/static/images/index_ad222.jpg"></a>
  84. </div>
  85. <div class="content">
  86. <div class="left">
  87. <div class="content-box">
  88. <div class="box-head">头条</div>
  89. <div class="box-body">
  90. <ul class="toutiaolist">
  91. <li><a href="#">php中文网原创视频:《天龙八部》公益ph</a></li>
  92. <li><a href="#">php中文网《玉女心经》公益PHP培训系列</a></li>
  93. <li><a href="#">php的版本发展历史(1995-2020)</a></li>
  94. <li><a href="#">您知道吗?最好的语言:PHP 25 岁了!</a></li>
  95. <li><a href="#">史上最污技术解读,我竟然秒懂了</a></li>
  96. <li><a href="#">2020年最新5个简洁优秀的个人博客模板免</a></li>
  97. <li><a href="#">5款优秀的vue后台管理系统模板推荐</a></li>
  98. <li><a href="#">6个大气的bootstrap后台管理系统模板推荐</a></li>
  99. <li><a href="#">phpstudy v8.1.0.4 版本今日发布!</a></li>
  100. <li><a href="#">您知道吗?最好的语言:PHP 25 岁了!</a></li>
  101. <li><a href="#">史上最污技术解读,我竟然秒懂了</a></li>
  102. <li><a href="#">php中文网《玉女心经》公益PHP培训系列</a></li>
  103. </ul>
  104. </div>
  105. </div>
  106. </div>
  107. <div class="middle">
  108. <div class="content-box">
  109. <div class="box-head">最新课程</div>
  110. <div class="box-body">
  111. <ul class="courselist clear">
  112. <li><div class="course">1</div></li>
  113. <li><div class="course">2</div></li>
  114. <li><div class="course">3</div></li>
  115. <li><div class="course">4</div></li>
  116. <li><div class="course">5</div></li>
  117. <li><div class="course">6</div></li>
  118. </ul>
  119. </div>
  120. </div>
  121. </div>
  122. <div class="right">
  123. <div class="content-box">
  124. <div class="box-head">常用手册</div>
  125. <div class="box-body">
  126. <ul class="shouce">
  127. <li>
  128. <img src="https://www.php.cn/upload/system/000/000/001/57d55fe881432245.jpg">
  129. <a href="#">php手册Linux手册</a>
  130. <a href="#">ThinkPHP6.0CI手册大全</a>
  131. </li>
  132. <li>
  133. <img src="https://www.php.cn/upload/system/000/000/001/57d55fe881432245.jpg">
  134. <a href="#">php手册Linux手册</a>
  135. <a href="#">ThinkPHP6.0CI手册大全</a>
  136. </li>
  137. <li>
  138. <img src="https://www.php.cn/upload/system/000/000/001/57d55fe881432245.jpg">
  139. <a href="#">php手册Linux手册</a>
  140. <a href="#">ThinkPHP6.0CI手册大全</a>
  141. </li>
  142. <li>
  143. <img src="https://www.php.cn/upload/system/000/000/001/57d55fe881432245.jpg">
  144. <a href="#">php手册Linux手册</a>
  145. <a href="#">ThinkPHP6.0CI手册大全</a>
  146. </li>
  147. <li>
  148. <img src="https://www.php.cn/upload/system/000/000/001/57d55fe881432245.jpg">
  149. <a href="#">php手册Linux手册</a>
  150. <a href="#">ThinkPHP6.0CI手册大全</a>
  151. </li>
  152. <li>
  153. <img src="https://www.php.cn/upload/system/000/000/001/57d55fe881432245.jpg">
  154. <a href="#">php手册Linux手册</a>
  155. <a href="#">ThinkPHP6.0CI手册大全</a>
  156. </li>
  157. </ul>
  158. </div>
  159. </div>
  160. </div>
  161. </div>
  162. </div>
  163. <div class="footer">
  164. <div class="content">
  165. <p>关于我们 | 免责申明 | 赞助与捐赠 | 广告合作</p>
  166. <p>php中文网:公益在线php培训,帮助PHP学习者快速成长!</p>
  167. <p>Copyright 2014-2020 https://www.php.cn/ All Rights Reserved | 皖B2-20150071-9 皖公网安备 34010402701654号</p>
  168. <p>座机号码:0551-64933227 安徽省合肥市政务新区置地广场D座2101</p>
  169. </div>
  170. </div>
  171. <script>
  172. const navs = document.querySelectorAll('.nav > li');
  173. navs.forEach(function (nav) {
  174. nav.addEventListener('mouseover', showMenu);
  175. nav.addEventListener('mouseout', closeMenu);
  176. });
  177. function showMenu (event) {
  178. if(event.target.nextElementSibling != null && event.target.nextElementSibling.nodeName == 'UL'){
  179. event.target.nextElementSibling.style.display = 'block';
  180. }
  181. const currentnav = event.currentTarget;
  182. const navbar = document.createElement('span');
  183. navbar.classList.add('navbar');
  184. currentnav.appendChild(navbar);
  185. }
  186. function closeMenu (event) {
  187. if(event.target.nextElementSibling != null && event.target.nextElementSibling.nodeName == 'UL'){
  188. event.target.nextElementSibling.style.display = 'none';
  189. }
  190. const navbars = document.querySelectorAll('.navbar');
  191. navbars.forEach(function (navbar) {
  192. navbar.parentNode.removeChild(navbar);
  193. });
  194. }
  195. </script>
  196. </body>
  197. </html>

学习小结

1、本次练习结合了之前学过的下拉菜单、事件监听,之前学的好多记不住都忘记了,练习时候又回过头看直播回放视频,巩固了一下;
2、现在对绝对定位、相对定位以及浮动有了更深的理解;

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