1. CSS within the tag. 2. CSS within the web page. 3.link referenced CSS. 4.Import the referenced CSS.
The following is the source code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>引入CSS的四种方式</title>
<style type="text/css">
/*h2{ color:white;background-color:blue;}*/
/*要想使网页内的CSS生效，必须注释下一行代码*/
@import "import.css";
</style>
<link href="alone.css" rel="stylesheet" type="text/css" />
</head>
<body>
<h1 id="标签内的CSS">标签内的CSS</h1>
<h2 id="网页内的CSS">网页内的CSS</h2>
<h3 id="link引用的CSS文件">link引用的CSS文件</h3>
<h4 id="import引用的CSS文件">import引用的CSS文件</h4>
<p>link引用和import引用区别是：link是html加载前就引用，而import是html加载后才引用。举例，采用impor引用，会先显示无样式的页面，然后再把样式放进去。如果用JavaScript动态引用CSS，得使用link引用方式才可实现。</p>
</body>
</html>import.css
@charset "utf-8";
/* CSS Document */
h4{ color:#000000; background-color:#009900;
}alone.css
@charset "utf-8";
h3{ color:white; background-color:red;}
/* CSS Document */In line with nature and endless. . .
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