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html样式选择器和下拉菜单
寻梦人
Original
413 people have browsed it

html 样式选择器

  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>Document</title>
  8.   </head>
  9.   <body>
  10.     <!-- 基本选择器 -->
  11.     <h2>1.基本选择器</还>
  12.     <p class="aa">php.cn</p>
  14.     <!-- 上下文选择器 -->
  15.     <h2>2.上下文选择器</h2>
  16.     <h3>2-1.父子</h3>
  17.     <ul class="list1">
  18.       <li class="item">item1</li>
  19.       <li class="item">item2
  20.         <ul>
  21.             <li class="item">item2-1</li>
  22.             <li class="item">item2-2</li>
  23.             <li class="item">item2-3</li>
  24.         </ul>
  25.       </li>
  26.       <li class="item">item3</li>
  27.     </ul>
  29.     <h3>2-2.后代</h3>
  30.     <ul class="list2">
  31.       <li class="item">item1</li>
  32.       <li class="item">item2
  33.         <ul>
  34.             <li class="item">item2-1</li>
  35.             <li class="item">item2-2</li>
  36.             <li class="item">item2-3</li>
  37.         </ul>
  38.       </li>
  39.       <li class="item">item3</li>
  40.     </ul>
  42.     <h3>2-3.兄弟</h3>
  43.     <ul class="list3">
  44.       <li class="item first">item1</li>
  45.       <li class="item">item2</li>
  46.       <li class="item">item3</li>
  47.     </ul>
  49.      <h3>2-4.同级</h3>
  50.     <ul class="list4">
  51.       <li class="item first">item1</li>
  52.       <li class="item">item2</li>
  53.       <li class="item">item3</li>
  54.     </ul>
  56.     <!-- 伪类选择器 -->
  57.     <h2>3.伪类选择器</h2>
  58.     <ul class="list5">
  59.         <li class="item">item1</li>
  60.         <li class="item">item2</li>
  61.         <li class="item">item3</li>
  62.         <li class="item">item4</li>
  63.         <li class="item">item5</li>
  64.         <li class="item">item6</li>
  65.         <li class="item">item7</li>
  66.         <li class="item">item8</li>
  67.         <li class="item">item9</li>
  68.     </ul>
  69.   </body>
  70.   <style>
  71.     /* 基本选择 */
  72.     .aa {
  73.       color: red;
  74.       font-size: 1em;
  75.     }
  77.     /* 父级 */
  78.     .list1>.item{
  79.         border: thin solid red;
  80.     }
  82.     /* 后代 */
  83.     .list2 .item{
  84.        border: thin solid blue; 
  85.     }
  87.     /* 兄弟 */
  88.     .list3 .first + *{
  89.         background-color: red;
  90.     }
  92.     /* 同级 */
  93.     .list4 .first~*{
  94.         background-color: yellow;
  95.     }
  97.     /* 伪类选择器 */
  99.     /* 第一个  */
  100.     .list5 .item:first-child{
  101.         color: green;
  102.     }
  104.     /* 最后一个 */
  105.     .list5 .item:last-child{
  106.         color: blue;
  107.     }
  109.     /* 前两个 */
  110.     .list5 .item:nth-child(-n+2){
  111.         background-color: lightgreen;
  112.     }
  114.     /* 最后两个 */
  115.     .list5 .item:nth-last-child(-n+2){
  116.         background-color: lightsalmon;
  117.     }
  119.     /* 偶位数 */
  120.     /* 2n===even */
  121.     .list5 .item:nth-child(even){
  122.         background-color: aqua;
  123.     }
  125.     /* 奇数位 */
  126.     /* 2n+1===odd */
  127.     .list5 .item:nth-child(odd){
  128.         background-color: lightsalmon;
  129.     }
  130.   </style>
  131. </html>

下拉菜单：

  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>Document</title>
  8.   </head>
  9.   <body>
  10.     <nav>
  11.       <label for="menu" class="menu">前端</label>
  12.       <input type="checkbox" name="menu" id="menu" />
  14.       <ul>
  15.         <li>html</li>
  16.         <li>css</li>
  17.         <li>javascript</li>
  18.       </ul>
  19.     </nav>
  20.   </body>
  21.   <style>
  22.     * {
  23.       margin: 0;
  24.       padding: 0;
  25.       box-sizing: border-box;
  26.     }
  27.     #menu {
  28.       display: none;
  29.     }
  31.     ul {
  32.       display: none;
  33.     }
  34.     #menu:checked + ul {
  35.       display: block;
  36.     }
  37.     nav {
  38.       width: 6em;
  39.       height: 1.6em;
  40.       text-align: center;
  41.       line-height: 1.6em;
  42.       background-color: aqua;
  43.       margin: 3em;
  44.       border: 1px solid #a3a3a3;
  45.     }
  47.     nav li {
  48.       list-style: none;
  49.       border-bottom: 1px solid #a3a3a3;
  50.       background-color: aqua;
  51.     }
  52.     nav li:hover {
  53.       cursor: pointer;
  54.       background-color: rgb(255, 103, 124);
  55.       color: white;
  56.     }
  57.   </style>
  58. </html>

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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