In BS, we have all learned xml, html, css and js. At first, we could not distinguish the differences and connections between the four. As our knowledge increased, we gained some understanding.
For the first time, let’s take a look at what these four technologies are and what they can do?
(1) XML—Extensible Markup Language
Extensible Markup Language (a subset of Standard Generalized Markup Language) is a simple data storage language that uses a series of simple tags to describe data, and these tags can be established in a convenient way. Although Extensible Markup Language takes takes up more space than binary data, but extensible markup language is extremely simple to master and use.
<Hello> <bcd>China</bcd> <bcd>USA</bcd> <bcd>UK</bcd> </Hello>
(2) HTML—Hypertext Markup Language.
Hypertext Markup Language. It uses markup symbols to mark various parts of the web page to be displayed. The web page file itself is a text file. By adding tags to the text file, you can tell the browser how to display the content (such as how to process text, how to arrange pictures, how to display pictures, etc.). The browser reads web page files in sequence, and then interprets and displays the tagged content according to the tags,
<html> <head> <title>HTML</title> </head> <body> </body> </html>
HTML text contains so-called "link points". HTML uses hyperlinks to organize text information in various spaces into a network of text. In general, HTML is a language that integrates web page structure and content display.
(3) CSS—Cascading Style Sheet
Cascading style forms. It is a markup language that separates style information from web page content. In our beef brisket news release system, we have used CSS files to modify the styles of some labels.
We use CSS to define styles for each HTML element, which can also be used for multiple interfaces. When doing a global update, just modify the style.
body {
border :1px solid #000;/*整体的边框*/
font-size :14px;
}
To put it bluntly, CSS is the language for setting the attributes of HTML elements on web pages.
(4) JavaScript
I was very depressed at first. Why is its name so similar to Java?
This is a typical marketing success. Its promotion success also borrowed from Java. When Microsoft began to realize that Javascript was becoming popular among web developers, Microsoft followed suit and created its own scripting language, JScript.
Javascript is a scripting language based on Object and Event Driven with security features. The purpose of using it is to work with HTML hypertext markup language and Java script language (Java applet) to link multiple objects in a Web page and interact with Web clients. For example, you can set mouseover effects, validate forms on the client, create customized HTML pages, display warning boxes, set cookies, and more.
function jsHello(){
alert('Hello World！');
}
Embed the code into HTML language and it will pop up a "Hello World" dialog box when loading. As for how to embed it, we already knew it at the beginning of learning JS video.
This is all about the differences between XML, HTML, CSS and JS. I will also introduce you to the effect of combining these in the future. Interested friends please pay attention to the Script House website.
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