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1221 定位的类型与应用场景和使用条件+实现一个模态框
一米互联
Original
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1. 简述定位的类型与应用场景和使用条件

定位:position
定位的四种类型

  1. 静态定位:static
    1. position: static; 默认,文档流定位
  2. 相对定位:relative
    1. position: relative; 相对于该元素在文档流中的原始位置进行偏移
  3. 绝对定位:absolute
    1. position: absolute; 相对于它的祖先中离它最近的”定位元素”的位置发生偏移
    2. 如果祖先元素中不存在定位元素,它就参考根元素(html)进行定位。
    3. 只要元素中有position: relative;
      或者position: absolute; 就称之为定位元素
  4. 固定定位:fixed
    1. position: fixed; 是绝对定位的一个特例,它始终相对于html定位

相对定位:

  1. *{
  2. margin: 0;
  3. padding: 0;
  4. box-sizing: border-box;
  5. }
  6. .pos{
  7. width:15em;
  8. height:15em;
  9. border: 2px solid black;
  10. }
  11. .pos h2{
  12. background: lightgreen;
  13. position: relative;
  14. top: 1em;
  15. left: 2em;
  16. }
  1. <div class="pos">
  2. <h2>小标题</h2>
  3. <p>PHP中文网因专业的讲师水平和高效的视频质量,我们在这篇文章中特意将《天龙八部》系列课程整理出来供大家有针对性得学习!</p>
  4. </div>

绝对定位:

  1. *{
  2. margin: 0;
  3. padding: 0;
  4. box-sizing: border-box;
  5. }
  6. .pos{
  7. width:15em;
  8. height:15em;
  9. border: 2px solid black;
  10. position: relative;
  11. }
  12. .pos h2{
  13. background: lightgreen;
  14. position: absolute;
  15. top: 1em;
  16. left: 2em;
  17. }


固定定位

  1. *{
  2. margin: 0;
  3. padding: 0;
  4. box-sizing: border-box;
  5. }
  6. html{
  7. min-height: 100em;
  8. }
  9. .pos{
  10. width:15em;
  11. height:15em;
  12. border: 2px solid black;
  13. margin: 10em auto;
  14. }
  15. .pos h2{
  16. width: 15em;
  17. height: 5em;
  18. text-align: center;
  19. line-height: 5em;
  20. background: lightgreen;
  21. position:fixed;
  22. }

2模仿课堂案例,实现一个模态

css代码:

  1. <style>
  2. *{
  3. margin: 0;
  4. padding: 0;
  5. box-sizing: border-box;
  6. }
  7. header{
  8. background: cornsilk;
  9. padding: 1em 2em;
  10. overflow: hidden;
  11. }
  12. header h2{
  13. float: left;
  14. }
  15. header button{
  16. float: right;
  17. width: 10em;
  18. height: 2.5em;
  19. background: rgb(211, 174, 162);
  20. transition: 0.5s;
  21. }
  22. header button:hover{
  23. cursor: pointer;
  24. background-color: #fff;
  25. }
  26. /* 模态框样式内容 */
  27. .modal .modal-backdrop{
  28. position:fixed;
  29. top: 0;
  30. bottom: 0;
  31. left: 0;
  32. right: 0;
  33. background-color: rgb(7, 7, 7,0.5);
  34. }
  35. .modal .modal-body{
  36. padding: 1em;
  37. min-width: 20em;
  38. border: 1px solid black;
  39. background:linear-gradient(to right,lightcyan,white);
  40. position: fixed;
  41. top: 5em;
  42. left: 30em;
  43. right: 30em;
  44. }
  45. .modal {
  46. display: none;
  47. }
  48. .modal-body{
  49. position: relative;
  50. }
  51. .close{
  52. position: absolute;
  53. top: 0;
  54. right: 0;
  55. border-radius: 0;
  56. border: 0.1px solid rgb(153, 153, 153);
  57. }
  58. .modal-body button.click{
  59. width: 13em;
  60. height: 2em;
  61. transition: 0.5s;
  62. }
  63. .modal-body button.click:hover{
  64. background: white;
  65. border: 1px solid #ccc;
  66. }
  67. </style>

html代码:

  1. <body>
  2. <!--头部信息-->
  3. <header>
  4. <h2>我的博客:</h2>
  5. <button>登  录</button>
  6. </header>
  7. <!--模态框-->
  8. <div class="modal">
  9. <!-- 蒙版:用来盖住后面的内容,半透明状态 -->
  10. <div class="modal-backdrop"></div>
  11. <!--主体内容-->
  12. <div class="modal-body">
  13. <button class="close">关闭</button>
  14. <form action="" method="POST">
  15. <table>
  16. <caption>用户登录</caption>
  17. <tr>
  18. <td><label for="email">邮箱:</label></td>
  19. <td><input type="email" name="email" id="email" /></td>
  20. </tr>
  21. <tr>
  22. <td><label for="password">密码:</label></td>
  23. <td><input type="password" name="password" id="password" /></td>
  24. </tr>
  25. <tr>
  26. <td></td>
  27. <td><button class="click">点此登录</button></td>
  28. </tr>
  29. </table>
  30. </form>
  31. </div>
  32. </div>
  33. <script src="modal.js"></script>
  34. </body>


Correcting teacher:天蓬老师天蓬老师

Correction status:qualified

Teacher's comments:
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