A callback function in JavaScript is a type of function that is passed as an argument to another function. This function is then called inside the parent function to complete a routine or an action. In simpler
Event-driven programming.JavaScript is event-driven, meaning it responds to user interactions such as clicks, keypresses, and mouse movements. Developers can define event handlers—functions that execute in response to specific events—to create interactive features on web pages. Document object model ...
This code will send a GET request to the URL specified and then alert the response (in this case, an HTML document). It's important to note that if the request fails, the .then() method will return an error. It is your job as a developer to handle these errors gracefully. Let's ...
The HTTP response contains the following elements: Status line The status line is the first line in the request message, and it contains three items: The HTTP version number. Displays the HTTP specification. The status code, which indicates the result of the request. ...
The implementation of JavaScript code in Node.js also plays an important role in web development. Node.js can reduce server response time due to its single-threaded nature and non-blocking architecture and omit delays. Node.js is also lightweight enough to serve as a scalable tool for microser...
These values create conditions and determine how a program behaves in response to a certain event (e.g., if "X condition" is true, then do "Y"). Example 1: If a user types the correct password, then allow them to log in.
response coderes.writeHead(200,headers);// create a client object and add it to the listconstid=Date.now();constclient={id,res,};allConnectedClients.push(client);console.log(`Client is connected Successfully and its id is:${id}`);req.on("close",()=>{console.log(`Client is ...
一、What is HTTP? 这个问题如果大家看过前面几篇文章,肯定能很轻易的回答:HTTP是应用层协议,用来传输超文本,或者可以说是用来传输超媒体的一种协议,HTTP是无状态的基于请求-响应模型的。你说的没错,接下来我也可能会聊到你想到的这些。但是还有呢?还有呢?下面,我们就来捋一捋HTTP的特点,来说一下这“还有”...
Parsing occurs in the first three stages of the compilation process -- lexical, syntax and semantic analysis. What are the main types of parsers? When a software language is created, its creators must specify a set of rules. These rules provide the grammar needed to construct valid statements...
ExpressJS and NodeJS are different from each other in many ways, some of them are: NodeJS is a JavaScript runtime that provides a platform for executing JavaScript code on the server side.ExpressJS, on the other hand, is a web framework built on top of NodeJS that provides a suite of...