How to run javascript on computer

With the popularity of the Internet, JavaScript has become a widely used programming language. Not only are JavaScript often used in web pages, but many computer software may also run JavaScript programs. So, how does a computer run javascript?

First of all, we need to understand that javascript is an interpreted language. In other words, JavaScript does not need to be compiled into binary code and can be run directly in the browser or other applications. Therefore, we need an interpreter that can interpret javascript code and run it.

Most browsers have built-in javascript interpreters. When we open a page in the browser, the browser parses the HTML and CSS and then renders the page. At the same time, the browser will also parse the JavaScript code and run the corresponding program. For example, clicking a button on a web page may trigger a javascript program to implement some interactive logic or page jumps.

In addition to browsers, we can also use some integrated development environments (IDE) or command line tools to run javascript programs. For example, node.js is a well-known JavaScript running environment. It can run JavaScript code on a computer or server, and provides many built-in APIs to facilitate file reading and writing, network communication and other operations.

Before we write a javascript program, we need to choose a suitable editing tool. Compared with the default console of the browser or the command line interface of node.js, a professional code editor can provide better code prompts, error checking and other functions. Common editors include Visual Studio Code, Sublime Text, Atom, etc.

Next, we can write our own javascript program. In the browser, we can directly use the <script> tag in the page to include the javascript code, or we can save the javascript code separately in a .js file, and then use <script src="xxx.js"> </script> to quote. In node.js, you can create a new .js file, then open and run it through the command line or editor.

Whether it is in the browser or node.js, we can use the console.log() function to output some debugging information to help us determine the running status of the program.

Finally, it should be noted that javascript code may be subject to some security restrictions. For example, in browsers, due to the security risks of cross-site scripting attacks (XSS), browsers will restrict the access rights of javascript programs to web pages under other domain names. In node.js, we also need to handle some sensitive information carefully to prevent the program from being used by hackers.

In general, JavaScript is a widely used programming language. Whether in a browser or in computer software, we can use it to complete many tasks. Learning how to run javascript programs is very helpful to improve our programming skills.

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