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定位的类型与应用场景和使用条件、模态框的应用
Y的博客
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定位的类型与应用场景和使用条件

  1. 定位的类型
  • 静态定位（position: static） 默认,也就是文档流定位,元素的显示位置与源码顺序一致;

  • 相对定位（position: relative）相对于该元素在文档流中的原始位置进行偏移；

    1. <style>
    2.       * {
    3.           padding: 0;
    4.           margin: 0;
    5.           box-sizing: border-box;
    6.       }
    7.       .box {
    8.           height: 10em;
    9.           width: 10em;
    10.           background-color: seagreen;
    12.       }
    13.       .box h2 {
    14.           width: 4em;
    15.           height: 1.5em;
    16.           background-color: skyblue;
    17.           position: relative;
    18.           top: .1em;
    19.           left:.1em;
    21.       }

  • 绝对定位 （position: absolue） 相对于它的祖先中离它最近的”定位元素”的位置发生偏移

    1. <style>
    2.       * {
    3.           padding: 0;
    4.           margin: 0;
    5.           box-sizing: border-box;
    6.       }
    7.       .box {
    8.           height: 10em;
    9.           width: 10em;
    10.           background-color: seagreen;
    11.           position: relative;
    12.           top: 3em;
    13.           left: 4em;
    15.       }
    16.       .box h2 {
    17.           width: 4em;
    18.           height: 1.5em;
    19.           background-color: skyblue;
    20.           position: absolute;
    21.           top: 5em;
    22.           left: 5em;
    24.       }
    25.   </style>

  • 固定定位（position: fixed）是绝对定位的一个特例,它始终相对于html定位

    1. <style>
    2.       * {
    3.           padding: 0;
    4.           margin: 0;
    5.           box-sizing: border-box;
    6.       }
    7.       .box {
    8.           height: 10em;
    9.           width: 10em;
    10.           background-color: seagreen;
    11.           position: fixed;
    12.           right: 1em;
    13.           bottom: 1em;
    15.       }
    16.       .box h2 {
    17.           width: 4em;
    18.           height: 1.5em;
    19.           background-color: skyblue;
    20.           position: relative;
    21.           top: .1em;
    22.           left: .1em;
    24.       }
    25.   </style>

    2.模态框的应用 

  1. <!DOCTYPE html>
  2. <html lang="en">
  4. <head>
  5.     <meta charset="UTF-8">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>模态框</title>
  8.     <style>
  9.         * {
  10.             padding: 0;
  11.             margin: 0;
  12.             box-sizing: border-box;
  13.         }
  15.         header {
  16.             background-color: lightgrey;
  17.             padding: 0.5em 2em;
  18.             overflow: hidden;
  19.         }
  21.         header h2 {
  22.             float: left;
  23.         }
  25.         header button {
  26.             float: right;
  27.             width: 10em;
  28.             height: 2.5em;
  29.             border-radius: 0.2em;
  30.         }
  32.         header button:hover {
  33.             cursor: pointer;
  34.             background-color: lightseagreen;
  35.         }
  37.         .modal .modal-backdrop {
  38.             background-color: rgb(0, 0, 0, 0.5);
  39.             position: fixed;
  40.             top: 0;
  41.             left: 0;
  42.             right: 0;
  43.             bottom: 0;
  45.         }
  47.         .modal .modal-body {
  48.             padding: 1em;
  49.             min-width: 20em;
  50.             border: 1px solid #000;
  51.             background-color: rgba(176, 235, 225, 0.781);
  52.             position: fixed;
  53.             top: 5em;
  54.             left: 30em;
  55.             right: 30em;
  56.         }
  58.         .modal .modal-body .close {
  59.             float: right;
  60.         }
  62.         .modal .modal-body table {
  63.             margin: auto;
  64.             padding: 1em;
  65.         }
  67.         .modal form table button {
  68.             width: 6em;
  69.             height: 3em;
  70.             background-color: thistle;
  71.             position: relative;
  72.             top: 1em;
  73.             left: 8em;
  75.         }
  77.         .modal form table button:hover {
  78.             cursor: pointer;
  79.             background-color: turquoise;
  81.         }
  83.         .modal {
  84.             display: none;
  85.         }
  86.     </style>
  87. </head>
  89. <body>
  90.     <!-- 页眉 -->
  91.     <header>
  92.         <h2>我的博客</h2>
  93.         <button>登录</button>
  94.     </header>
  95.     <!-- 模态框 -->
  96.     <div class="modal">
  97.         <!-- 蒙版：用来遮罩后面的内容使他半透明 -->
  98.         <div class="modal-backdrop"></div>
  99.         <!-- 主体 -->
  100.         <div class="modal-body">
  101.             <button class="close">关闭</button>
  102.             <form action="" method="post">
  103.                 <table>
  104.                     <caption>用户登录</caption>
  105.                     <tr>
  106.                         <td><label for="email">邮箱</label></td>
  107.                         <td><input type="email"></td>
  108.                     </tr>
  109.                     <tr>
  110.                         <td><label for="password">密码</label></td>
  111.                         <td><input type="password" name="password" id="password"></td>
  112.                     </tr>
  113.                     <tr>
  114.                         <td><button>登录</button></td>
  115.                     </tr>
  116.                 </table>
  117.             </form>
  118.         </div>
  119.     </div>
  120.     <script src="../1221/modal.js"></script>
  121. </body>
  123. </html>
Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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