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选择器的认识和实战
风残念北的博客
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1.选择器

1.1基本选择器

1.1.1标签选择器

  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>标签选择器</title>
  8.     <link rel="stylesheet" href="./style.css">
  9. </head>
  10. <body>
  11.     <h1>PHP中文网</h1>
  12. </body>
  13. </html>
  1. h1 {
  2.     color: red;
  3. }

1.1.2属性选择器

代码演示

  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>属性选择器</title>
  8.     <link rel="stylesheet" href="./style.css">
  9. </head>
  10. <body>
  11.     <h1 class="title">PHP中文网</h1>
  12.     <h2 id="name">Hello World</h2>
  13. </body>
  14. </html>
  1. h1.title {
  2.     color: red ;
  3. }
  5. h2#name {
  6.     color:blue;
  7. }

效果展示

属性选择器

1.2伪类选择器

1.2.1结构伪类

  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>伪类结构选择器</title>
  8.     <link rel="stylesheet" href="./selecter.css">
  9. </head>
  10. <body>
  11.     <ul class="list">
  12.         <li>item1</li>
  13.         <li>item2</li>
  14.         <li>item3</li>
  15.         <li>item4</li>
  16.         <li>item5</li>
  17.         <li>item6</li>
  18.         <li>item7</li>
  19.         <li>item8</li>
  20.         <li>item9</li>
  21.     </ul>
  22. </body>
  23. </html>

css代码段

  1. .list > :nth-child(3){
  2.     color: red;
  3. }
  4. /* 第一个 */
  5. .list :first-child{
  6.     color: blue;
  7. }
  8. /* 最后一个 */
  9. .list > :last-child{
  10.     color: lightgreen;
  11. }
  12. /* 偶数改变颜色，利用2n */
  13. .list > :nth-child(2n){
  14.     color: lightpink;
  15. }

效果展示

伪类结构选择器

1.2.2状态伪类

代码演示

  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>状态伪类</title>
  8.     <link rel="stylesheet" href="fake-status.css">
  9. </head>
  10. <body>
  11.     <form action="login.php" method="post">
  12.         <fieldset style="width: 180px;">
  13.             <legend>用户登录</legend>
  14.             <input type="text" name="username" id="username" placeholder="请输入用户名">
  15.             <input type="password" name="password" id="password" placeholder="请输入密码">
  16.             <div>
  17.                 <input type="checkbox" name="remember" id="remember">
  18.                  <label for="remember">记住我</label>
  19.             </div>
  20.             <button>登录</button>
  21.         </fieldset>
  22.     </form>
  23. </body>
  24. </html>

css代码

  1. /* 获取到焦点时对背景颜色进行改变 */
  2. fieldset :focus{
  3.     background-color: green;
  4. }
  5. /* 改变鼠标样式 */
  6. fieldset :hover{
  7.     cursor: pointer;
  8. }
  9. /* 点击记住我改变label颜色 */
  10. input[type='checkbox']:checked + label{
  11.     color: red;
  12. }

效果展示

1.3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>下拉菜单（状态伪类）</title>
  8.     <link rel="stylesheet" href="./04.css">
  9. </head>
  10. <body>
  11.     <div class="box">
  12.         <label for="menu">城市列表</label>
  13.         <input type="checkbox" name="city" id="menu">
  14.         <ul>
  15.             <li><a href="">博乐市</a></li>
  16.             <li><a href="">上海市</a></li>
  17.             <li><a href="">深圳市</a></li>
  18.         </ul>
  20.     </div>
  21. </body>
  22. </html>

css代码

  1. #menu {
  2.     display: none;
  3. }
  5. #menu:checked + ul{
  6.     display: none;
  7. }

1.3.1效果展示

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：完成的不错，继续加油
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