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How to call css style

PHPz

Release： 2023-04-21 13:36:57

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With the continuous development of the Internet, the design and development of web pages are becoming more and more important. CSS (cascading style sheet) is a language used to control the style of web pages, and it is also a technology that must be mastered in web development. But some beginners may not know how to call CSS styles. This article will introduce you to the calling method of CSS styles in detail.

1. Embedded style sheet

Use the style tag in the HTML file to define an embedded style sheet. The styles defined in the style sheet are only valid for the current page, such as:

<!DOCTYPE html>
<html>
<head>
  <title>内嵌样式表</title>
  <style>
    body {
      background-color: #f0f0f0;
    }
    h1 {
      color: red;
    }
  </style>
</head>
<body>
  <h1>欢迎访问我的网站</h1>
  <p>这里是我的个人主页，欢迎来逛逛。</p>
</body>
</html>

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In the above example, two styles are defined internally through the style tag, which are used to set the background color and title font color of the web page. By running the code, you can find that the background color of the page changes to gray and the font color of the title changes to red.

2. External style sheet

Use the link tag in the HTML file to introduce an external style sheet. The style sheet will not be embedded in the HTML file, but will exist independently in a CSS file. It can be shared by multiple HTML files, making the structure of the HTML file more concise and easier to maintain, such as:

<!DOCTYPE html>
<html>
<head>
  <title>外部样式表</title>
  <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
  <h1>欢迎访问我的网站</h1>
  <p>这里是我的个人主页，欢迎来逛逛。</p>
</body>
</html>

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In the above example, a CSS file named style.css is introduced through the link tag. In this file Multiple styles can be defined, and the style sheet can be shared in multiple HTML files through links to achieve style reuse. The way to define styles in style.css is similar to the inline style sheet, for example:

body {
  background-color: #f0f0f0;
}
h1 {
  color: red;
}

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In this example, the body selector is used to set the background color of the web page, and the h1 selector is used to set the title font color. When this style sheet is referenced in multiple HTML files, these styles will be shared.

3. Inline styles

Inline style sheets define styles in HTML tags. The styles can be directly applied to a certain tag, such as:

<!DOCTYPE html>
<html>
<head>
  <title>内联样式表</title>
</head>
<body>
  <h1 style="color:red">欢迎访问我的网站</h1>
  <p>这里是我的个人主页，欢迎来逛逛。</p>
</body>
</html>

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The above example An inline style sheet is defined in the h1 tag to set the title font color to red. Different from inline style sheets and external style sheets, inline style sheets are only valid for the current markup and cannot be reused. When there are many styles, the HTML code will appear disordered, which is not conducive to maintenance.

Summary:

To sum up, there are three ways to call CSS styles in HTML files: embedded style sheets, external style sheets and inline style sheets. For developing complex Web For applications, it is recommended to use external style sheets because it allows multiple HTML files to share styles, making it easier to develop and maintain. But for simple applications, inline style sheets and inline style sheets are also good choices. Different scenarios and needs require different technology choices. Mastering the above methods of calling CSS styles can make web development more efficient and flexible.

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