03-CSS编写规则和常用属性

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01 CSS编写规则

1.1 内联样式

<!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>Document</title>
</head>
<body>
  <div style="color: red; font-size: 30px;">div元素</div>
</body>
</html>

1.2 内部样式

把样式单独抽离出来

<!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>Document</title>
 <!-- 选择器 -->
<style>
   div {
      color: red;
      font-size: 30px;
      background-color: orange;
   }
</style>
</head>
<body>
   <div>div元素</div>
</body>
</html>

如果存在多个同样的标签

<!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>Document</title>
</head>
<!-- 选择器 -->
<style>
  .div-2 {
    color: red;
    font-size: 30px;
    background-color: orange;
  }
</style>
<body>
  <div>div元素</div>
  <div class="div-2">第2div元素</div>
</body>
</html>

1.3 外部样式

定义一个公共的css文件,其它的html文件都引用这个文件

00024.png

编写公共的样式

.title {
  color: red;
  font-size: 30px;
  background-color: orange;
}

test1.html

<!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>Document</title>
</head>
<link rel="stylesheet" href="./css/styel.css">
<body>
  <div class="title">test1中的title</div>
</body>
</html>

test2.html

<!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>Document</title>
</head>
<link rel="stylesheet" href="./css/style.css">
<body>
  <div class="title">test2中的title</div>
</body>
</html>

1.4 CSS样式很多的情况

实际工作中存在很多的css文件,如果一个个导入代码显得臃肿 可以写一个统一的入口 00127.png 入口文件

@import url(./style1.css);
@import url(./style2.css);

style1.css

.div {
  color: red;
  font-size: 20px;
}

style2.css

.title {
  color: red;
  font-size: 30px;
  background-color: orange;
}

html文件引入 test1.html

<!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>Document</title>
</head>
<link rel="stylesheet" href="./css/index.css">
<body>
  <div>test1中的title</div>
</body>
</html>

test2.html

<!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>Document</title>
</head>
<link rel="stylesheet" href="./css/index.css">
<body>
  <div class="title">test2中的title</div>
</body>
</html>

02-CSS常用的5个属性

2.1 font-size(字体大小)

谷歌默认的字体大小为16px

<!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>Document</title>
</head>
<style>
  .title {
    font-size: 24px;
  }
</style>
<body>
  <div class="title">test1中的title</div>
</body>
</html>

2.2 color(字体颜色)

<!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>Document</title>
</head>
<style>
  .title {
    color: red;
  }
</style>
<body>
  <div class="title">test1中的title</div>
</body>
</html>

2.3 background-color(背景色)

<!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>Document</title>
</head>
<style>
  .title {
    background-color: aqua;
  }
</style>
<body>
  <div class="title">test1中的title</div>
</body>
</html>

2.4 width(宽度)

<!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>Document</title>
</head>
<style>
  .title {
    background-color: aqua;
    width: 120px;
  }
</style>
<body>
  <div class="title">test1中的title</div>
</body>
</html>

00025.png

2.5 height

<!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>Document</title>
</head>
<style>
  .title {
    background-color: aqua;
    width: 120px;
    height: 50px;
  }
</style>
<body>
  <div class="title">test1中的title</div>
</body>
</html>

00026.png

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