表单和CSS选择器的案例 - PHP学习

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用户注册表单

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>用户注册表单</title>
  </head>
  <body>
    <h4>用户注册表单</h4>
    <form action="" method="POST">
      <fieldset>
        <legend>必填项</legend>
        <div>
          <label for="username">帐号:</label>
          <input
            type="text"
            id="username"
            name="username"
            autofocus
            required
            placeholder="不少于3位"
          />
        </div>
        <div>
          <label for="psw">密码:</label>
          <input type="password" id="password" name="password" required placeholder="不少于6位"/>
        </div>
        <div>
          <label for="male">性别:</label>
          <input type="radio" name="gender" value="male" id="male" checked/>男<label
            for=""
          ></label>
          <input type="radio" name="gender" value="female" />女<label
            for=""
          ></label>
          <input type="radio" name="gender" value="serret" />保密<label
            for=""
          ></label>
        </div>
        <div>
          <label for="tal">电话:</label>
          <input type="text" id="tal" name="tal" required />
        </div>
        <div>
          <label for="email">邮箱:</label>
          <input type="email" id="email" name="email" required />
        </div>
        <div>
          <label for="">爱好:</label>
          <input type="checkbox" id="html" name="php[]" checked /><label
            for="html"
            >学习前端</label
          >
          <input type="checkbox" id="JavaaScript" name="php[]" /><label
            for="JavaScript"
            >学习PHP</label
          >
          <input type="checkbox" id="css" name="php[]" /><label for="css"
            >学习java</label
          >
        </div>
            <label>居住地址:</label>
          <select name="level1" id="">
            <option selected>请选择（省）</option>
            <option value="1">海南省</option>
            <option value="2">广东省</option>
          </select>
          <select name="level2" id="">
            <option selected>请选择（市）</option>
            <option value="11">海口市</option>
            <option value="12">广州市</option>
          </select>
        </div>
        <div>
          <input type="reset" name="reset" value="清除" />
          <button>提交</button>
        </div>
      </fieldset>
    </form>
  </body>
</html>

基本选择器

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>基本选择器(标签和属性)</title>
    <style>
      li {
        background-color: blue;
      }
      li#one {
        background-color: chartreuse;
      }
      li.two {
        background-color: darkgreen;
      }
    </style>
  </head>
  <body>
    <!-- 基本选择器 -->
    <ul>
      <li id="one">item1</li>
      <li class="two">item2</li>
      <li>item3</li>
      <li>item4</li>
    </ul>
  </body>
</html>

上下文选择器

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>上下文选择器</title>
    <style>
      /* 1. 后代选择器,子子孙小全选中 : 空格 */
      ul li {
        background-color: darkgreen;
      }
      /* * 2. 子选择器 大于号 , 只匹配子一级,不匹配孙子*/
      body > ul > li {
        background-color: darkorchid;
      }
      /* 3. 同级相邻选择器, 加号 +  */
      .start1 + li {
        background-color: gold;
      }
      /* 4. 同级所有选择器, ~ 波浪线 */
      .start2 ~ li {
        background-color: maroon;
      }
    </style>
  </head>
  <body>
    <ul>
      <li>item1</li>
      <li>item2</li>
      <li>
        item3
        <ol>
          <li>item</li>
          <li>item</li>
          <li>item</li>
        </ol>
      </li>
      <li>item4</li>
    </ul>
    <hr />
    <ol>
      <li>item1</li>
      <li class="start1">item2</li>
      <!-- 同级相邻选择器 -->
      <li>item3</li>
      <li class="start2">item4</li>
      <!-- 同级所有选择器, -->
      <li>item5</li>
      <li>item6</li>
    </ol>
  </body>
</html>

Correcting teacher：

天蓬老师

Correction status：qualified

Teacher's comments：

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用户注册表单

基本选择器

上下文选择器