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CSS选择器与状态伪类,查看按钮显示隐藏内容
阿辉
Original
332 people have browsed it

作业/20230118

一、基本选择器(标签 属性)

  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>基本选择器</title>
  8. </head>
  9. <style>
  10. /* 1.标签选择器 */
  11. h1 {
  12. color: blue;
  13. }
  14. /* 2.属性选择器 */
  15. .attribute{
  16. color: red;
  17. border:2px solid red;
  18. border-radius: 5px;
  19. }
  20. </style>
  21. <body>
  22. <h1>1.标签选择器</h1>
  23. <hr>
  24. <h2 class="attribute">2.属性选择器</h2>
  25. </body>
  26. </html>

二、上下文选择器 (> 空格 + ~)

  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>上下文选择器</title>
  8. </head>
  9. <style>
  10. /* 父子:> */
  11. .list > .item {
  12. background-color: yellow;
  13. }
  14. /* 后代:空格 */
  15. .Descendants .item{
  16. border: 2px solid red;
  17. border-radius: 5px;
  18. }
  19. /* 兄弟:+ 找到第二个,选择第三个*/
  20. .brother > .item.two + * {
  21. color: blue;
  22. }
  23. /* 同级:~ 选择第二个,后面全部同化掉 */
  24. .peer > .item.two ~ * {
  25. border: 2px solid royalblue;
  26. border-radius: 10px;
  27. }
  28. </style>
  29. <body>
  30. <!-- 父子 -->
  31. <ul class="list">
  32. <li class="item">item</li>
  33. <li class="item">item</li>
  34. <li class="item">item</li>
  35. <li class="item">item</li>
  36. </ul>
  37. <!-- 后代 -->
  38. <ul class="Descendants">
  39. <li class="item">item1</li>
  40. <li class="item">item2
  41. <ul>
  42. <li class="item">item2-1</li>
  43. <li class="item">item2-2</li>
  44. <li class="item">item2-3</li>
  45. </ul>
  46. </li>
  47. <li class="item">item3</li>
  48. </ul>
  49. <!-- 兄弟 -->
  50. <ul class="brother">
  51. <li class="item">item1</li>
  52. <li class="item two">item2</li>
  53. <li class="item">item3</li>
  54. <li class="item">item4</li>
  55. </ul>
  56. <!-- 同级 -->
  57. <ul class="peer">
  58. <li class="item">item1</li>
  59. <li class="item two">item2</li>
  60. <li class="item">item3</li>
  61. <li class="item">item4</li>
  62. </ul>
  63. </body>
  64. </html>

三、伪类选择器()

1.:nth-child()获取元素的任意一个
2.:first-child语法糖,获取第一个
3.:last-child语法糖,获取最后一个

  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>伪类选择器</title>
  8. </head>
  9. <style>
  10. /* 选择第一个 */
  11. .list > :nth-child(1) {
  12. background-color: yellow;
  13. }
  14. /* 选择最后一个 */
  15. .list > :nth-child(3) {
  16. background-color: blue;
  17. }
  18. /* 选择任意一个 */
  19. .list > :nth-child(2) {
  20. border: 2px solid red;
  21. border-radius: 5px;
  22. color: red;
  23. }
  24. /* 第一个、最后一个可以使用语法糖 */
  25. /* .list > :first-child {
  26. color: red;
  27. }
  28. .list > :last-child {
  29. color: red;
  30. } */
  31. /* 获取前四个元素 */
  32. .example > :nth-child(-n + 4) {
  33. color: yellow;
  34. }
  35. /* 获取第六个以下所有元素 */
  36. .example > :nth-child(n + 6) {
  37. color:blue;
  38. }
  39. </style>
  40. <body>
  41. <ul class="list">
  42. <li>item1</li>
  43. <li>item2</li>
  44. <li>item3</li>
  45. </ul>
  46. <hr />
  47. <ul class="example">
  48. <li>item1</li>
  49. <li>item2</li>
  50. <li>item3</li>
  51. <li>item4</li>
  52. <li>item5</li>
  53. <li>item6</li>
  54. <li>item7</li>
  55. <li>item8</li>
  56. <li>item9</li>
  57. <li>item10</li>
  58. </ul>
  59. </body>
  60. </html>
  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>伪类选择器</title>
  8. </head>
  9. <style>
  10. /* 获取一组元素 */
  11. .list > :nth-child(1n + 1) {
  12. color: blue;
  13. }
  14. /* 从第五个起匹配一组 */
  15. .list > :nth-child(1n + 5) {
  16. color: gold;
  17. }
  18. /* 获取单数:nth-child(odd) */
  19. .list > :nth-child(odd) {
  20. border-style: solid;
  21. color: darkgrey;
  22. }
  23. /* 获取双数:nth-child(even) */
  24. .list > :nth-child(even) {
  25. text-align: center;
  26. }
  27. </style>
  28. <body>
  29. <ul class="list">
  30. <li>item1</li>
  31. <li>item2</li>
  32. <li>item3</li>
  33. <li>item4</li>
  34. <li>item5</li>
  35. <li>item6</li>
  36. <li>item7</li>
  37. <li>item8</li>
  38. <li>item9</li>
  39. <li>item10</li>
  40. </ul>
  41. </body>
  42. </html>

四、状态伪类

  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. <style>
  10. /* 获取焦点改颜色 */
  11. .username :focus {
  12. background-color: blue;
  13. }
  14. /* 悬停,改颜色 */
  15. /* .my :hover {
  16. background-color: black;
  17. } */
  18. /* 禁用h2显示 */
  19. h2 {
  20. display: none;
  21. }
  22. /* 放在按钮上面显示h2内容 */
  23. .my:hover h2 {
  24. display: block;
  25. }
  26. /* 隐藏后面内容 */
  27. .guess {
  28. display: none;
  29. }
  30. /* 鼠标碰到文本框显示文字,,不知道为会在下面 */
  31. .username:hover .guess {
  32. display: block;
  33. }
  34. </style>
  35. <body>
  36. <div class="username">
  37. <label for="uname">用户名:</label>
  38. <input
  39. type="text"
  40. name="username"
  41. id="uname"
  42. placeholder="用户账户"
  43. required/>
  44. <label for="" class="guess">你猜我在干嘛</label>
  45. </div>
  46. <div class="my">
  47. <button>查看我</button>
  48. <h2>没有秘密!</h2>
  49. </div>
  50. </body>
  51. </html>
Correcting teacher:PHPzPHPz

Correction status:qualified

Teacher's comments:作业完成的很好,只是你应该在提交作业的时候没有在“状态”这一栏选择“作业”
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