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表单应用以及css样式和选择器

作业内容：

制作一个用户注册表单,将课堂上提到的表单控件全部用到;
理解css模块的思想,并试写一个案例(选做);
实例演示基本选择器与上下文选择器。

用户注册表单

实例效果

html代码

<!DOCTYPE html>
<html lang="en">
<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</title>
</head>
<body>
<h3 algn="center">用户注册</h3>
<form action="" method="get"  style="display:grid;gap:0.5em">
    <fieldset>
        <legend>必填项</legend>
        <div>
            <label for="username">用户名:&nbsp;&nbsp;&nbsp;&nbsp;      </label>
            <input type="text" name="username" id="username" autofocus required placeholder="不少于8位"/>
          </div>
          <div>
            <label for="password">设置密码:</label>
            <input type="password" name="password" id="password" required placeholder="不少于6位"/>                         </div>
          <div>
            <label for="">确认密码:</label>
            <input type="password" name="psw" id="psw" placeholder="不少于6位"/> </div>
          <div>
            <label for="email">邮箱:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</label>
            <input type="email" name="email" id="email" required placeholder="demo@email.com" />
          </div>
    </fieldset>
  <div>
      <label for="male">性别:</label>
      <!-- 所有单选按钮的name必须相同 -->
      <input type="radio" name="gender" value="male" id="male" checked/><label for="">男</label>
      <input type="radio" name="gender" value="female"/><label for="">女</label>
</div>
  <div>
    <label>爱好:</label>
    <!-- 所有复选框的name属性必须写成数组格式 -->
    <input name="hobby[]" id="game" type="checkbox" checked/><label for="game">游戏</label>
    <input name="hobby[]" id="swim" type="checkbox" /><label for="swim">游泳</label>
    <input name="hobby[]" id="book" type="checkbox" checked/><label for="book">看书</label>
  </div>
  <div>
    <label for="">成分:</label>
    <select name="part" id="">
      <option value="1">党员</option>
      <option value="2">团员</option>
      <option value="3" selected>群众</option>
    </select>
  </div>
  <div>
      <label for="">搜索关键字:</label>
      <input type="search" name="search" list="keywords">
      <datalist id="keywords">
          <option value="html"></option>
          <option value="css"></option>
          <option value="js"></option>
          <option value="php"></option>
      </datalist>
  </div>
  <button type="submit">马上注册</button>
</form>
</body>
</html>

理解css模块的思想,并试写一个案例

实例截图

html代码

<!DOCTYPE html>
<html lang="en">
<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>css样式的模块化</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
<header>页眉</header>
<main>主体</main>
<footer>页脚</footer>
</body>
</html>

css代码
footer.css

footer {
height: 5em;
background-color: lightgreen;
}

header.css

header {
  height: 3em;
  background-color: lightblue;
}

main.css

main {
  flex: 1;
  background-color: aqua;
}

reset.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
a {
  color: #555;
  text-decoration: none;
}

style.css

@import url("reset.css");
@import url("main.css");
@import url("header.css");
@import url("footer.css");
@import url("public.css");

public.css

body {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

基本选择器与上下文选择器

基本选择器

<!DOCTYPE html>
<html lang="en">
<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>选择器：基本选择器,标签和属性选择器</title>
<style>
  /* 标签 */
  li {
    background-color: violet;
  }
  /* 属性 */
  li[id="foo"] {
    background-color: lightblue;
  }
  /* 因为id是通用且高频的属性，所以有一个快捷方式 */
  #foo {
    background-color: yellow;
  }
  .on {
    background-color: lightgreen;
  }
</style>
</head>
<body>
<ul>
  <li id="foo">item1</li>
  <li>item2</li>
  <li class="on">item3</li>
  <li class="on">item4</li>
  <li>item5</li>
</ul>
</body>
</html>

上下文选择器

<!DOCTYPE html>
<html lang="en">
<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>
  /* 上下文选择器，就是根据位置来选择 */
  /* 1.后代选择器,子子孙孙全选中空格 */
  ul li {
    background-color: lightblue;
  }
  /* 2.子选择器,只匹配子一级 */
  body > ul > li {
    background-color: lightgreen;
  }
  /* 3.同级相邻选择器，加号+ */
  .start + li {
    background-color: yellow;
  }
  /* 4.同级所有选择器 ~波浪线*/
  .start ~ li {
    background-color: violet;
  }
</style>
</head>
<body>
<ul>
  <li>item1</li>
  <li class="start">item2</li>
  <li>item3</li>
  <li>
    item4
    <ul>
      <li>item-1</li>
      <li>item-2</li>
      <li>item-3</li>
    </ul>
  </li>
  <li>item5</li>
</ul>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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