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A summary of how to introduce css styles into the web

伊谢尔伦Original: 2017-07-21 09:18:202432browse

HTML and CSS are two languages with different functions. They affect a web page at the same time, so CSS and HTML must be linked together.

The two simplest ways are to introduce it directly in the html tag, or declare it in front of the html file. The following is a simple code example

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        p{background-color:red;
        color: black}
    </style>
<!--这里是修饰所有的P标签里面的内容，这是引入方法的一种-->
 <style>
        div{background-color:chartreuse;
        color: coral}
    </style>
 
</head>
<body>
 
 
<p style="background-color: aquamarine;color: black">Jay</p>
<!--在css里面，要用分号区别各种属性,虽然这个P标签有css样式，但是文本的样式是就近原则，这是最简单的css引入方式-->
 
<p>Bob</p>
 
<div>spider
<p>我是个P</p>
</div>
<!--div里面的P标签在上面有div的样式而没有P标签样式时，按div标签的样式，否则按P标签的样式-->
 
 
</body>
</html>

The purpose of import and link is to An independent CSS file is introduced into the HTML file. The difference between the two is that the link type uses HTML tags to introduce external CSS files, while the import type uses CSS rules to introduce external CSS files.

Example of using a link to introduce an external CSS file:

<link href="~/Content/Base.css" rel="stylesheet" type="text/css" />

Example of using an import to introduce a CSS file:

<style type="text/css">
    @import "/Content/Base.css"
</style>

The difference in display effects between the two methods: using the link method , the CSS file will be loaded before loading the main part of the page, so that the displayed web page will have style effects from the beginning. When using the import method, the CSS file will be loaded after the entire page is loaded. For some browsers, in some cases, if the web page file is relatively large, an unstyled page will appear, which will flash for a while and then load again. The effect after setting the style appears. From a user experience perspective, this is a drawback of using import.

For some relatively large websites, in order to facilitate maintenance, you may want to write all CSS styles in several CSS files. In this way, if you use link import, you need several statements to import the CSS files separately. . If you want to adjust the classification of CSS files, you need to adjust the HTML files at the same time. This is a drawback for maintenance work. If you use the import method, you can only import a general CSS file, and then import other independent CSS files in this file.

If you only need to import one CSS file, use the link method; if you need to import multiple CSS files, first use the link method to introduce a "directory" CSS file, and then use import in this "directory" CSS file Import other CSS files.

But if you want to use JavaScript to dynamically decide which CSS file to import, you must use linking to achieve this.

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