Useful blog – Page 2 – IT technology sharing

The difference between HTML5 and web front-end

When it comes to web front-end technology, most people instinctively think of HTML5. Coupled with the popularity of apps and mini programs in recent years, web front-end development and HTML5…

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Cache

Cache control of servers The browser discovers that there is no data in the cache, so it sends a request to obtain resources from the server; The server responds to…

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JavaScript Object Oriented Programming – Pattern for Creating Objects

JS itself provides us with many objects such as Array, Date, and Math, but in actual development, we still use custom objects the most. Custom objects are a subject worth…

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React server-side rendering

What is server-side rendering? In the past, rendering work was mostly done on the client side, so why do we now let the server do this work? Is there any…

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Rules for element stacking order in CSS

When the z-index and position attributes are not included, the stacking order of all elements is consistent with the order in which they appear in the HTML document they are…

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The data types of JavaScript

There are a total of 6 data types in JavaScript. It can be divided into two categories: simple data types and complex data types. To clarify, the above statement should…

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JavaScript Variables : Scope, and Memory Issues

The values of basic types and reference types Two types of data for values Basic types are saved on the stack Save reference types in the heap 5 basic types…

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TypeScript has been a popular application in recent years, which has created an illusion: with so many supporters, is TypeScript a new language? TypeScript is an object-oriented programming language developed…

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Markdown:Getting Started Guide

Markdown is a lightweight "markup language" with many advantages, and it is currently widely used by more and more writing enthusiasts and writers. Please do not be confused by "tags"…

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Functions and Functional Programming

Among all the key knowledge that must be mastered in JavaScript, functions are the most easily overlooked knowledge point when we are beginners. In the process of learning, many people…

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HTML Fundamentals

The relationship between HTML, CSS, and JavaScript HTML is the carrier of webpage content. Content is the information that web creators place on a page to allow users to browse,…

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HTTP protocol

What is the HTTP protocol The HTTP protocol is an abbreviation for Hyper Text Transfer Protocol, which is a transfer protocol used to transfer hypertext from World Wide Web servers…

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Let command and const command

Let command usage ES6 has added the let command to declare variables. Its usage is similar to var, but the declared variables are only valid within the code block where…

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Event Loop

Why is JavaScript single threaded? JavaScript engine threads Related to its purpose. As a browser scripting language, JavaScript's main purpose is to interact with users and manipulate DOM. This determines…

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How JavaScript engines work

What is a JavaScript engine? A JavaScript engine is a program that helps to convert JavaScript code into lower level code or machine code. The ECMAScript standard is followed by…

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[JS] Object’s original value conversion

Before starting the article, we first need to understand what Symbol. toPrimitive is.Symbol. toPrimitive is a special type of Symbol value that can serve as an object's property key to…

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Introduction to Bootstrap

Introduction: Bootstrap, from Twitter, is currently a popular front-end framework. Bootstrap is based on HTML, CSS, and JAVASCRIPT, which is concise and flexible, making web development faster. It is a…

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Local storage method: Indexed Database

After the release of HTML5, an important feature added to the front-end was local storage, which can be divided into four categories: Local Storage: The total storage capacity is limited…

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Web Notification Message Notification

The Notification object is used to set and display desktop notifications for users, and its usage is relatively simple, directly instantiating the Notification object. var notification = new Notification(title,options); Title:…

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Using JavaScript to Get Location

Firstly, we will use Canuse cmd to check the compatibility of geolocation, as almost all modern browsers support geolocation Geolocation By using GPS, WIFI, and IP addresses to detect their…