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Instant Form Validation Using JavaScript

Instant Form Validation Using JavaScript

Real-time form verification: subtle improvements to enhance user experience Core points: JavaScript can be used to implement real-time form verification, which provides users with instant feedback on input validity, thereby improving user experience and maintaining data integrity, ensuring that only valid data is submitted. HTML5 attributes pattern and required can be used to define the valid input range of form elements. If the browser does not support these properties, its values ​​can be used as the basis for JavaScript compatibility populators. The aria-invalid property can be used to indicate whether the field is invalid. This property provides accessibility information and can be used as a CSS hook to visually indicate an invalid field. Ja

Feb 16, 2025 am 10:40 AM
How to Write Shell Scripts with JavaScript

How to Write Shell Scripts with JavaScript

JavaScript Scripting: Powerful Tools Beyond Browser Limits This article explores the possibility of writing shell scripts using JavaScript, and how to use Node.js to implement features such as file system traversal and text search. Key points: JavaScript applications are no longer limited to browsers, and can be effectively used for desktop scripting, including shell scripting. Node.js is a necessary condition for this process. JavaScript can recursively iterate over files in directories and recognize the occurrence of specified strings. This can be done using Node's native file system module (including the readdir method) and

Feb 16, 2025 am 10:33 AM
ES6 (ES2015) and Beyond: Understanding JavaScript Versioning

ES6 (ES2015) and Beyond: Understanding JavaScript Versioning

In recent years, the development of JavaScript has been surging. New ECMAScript specifications are released every year, making JavaScript version management, feature support for each version, and how to write future-oriented code is confusing. To better understand the reasons behind this seemingly continuous wave of updates, let’s briefly review the history of JavaScript and its versions and understand why the standardization process is so important. Key Points ES6 (also known as ES2015) marks a major shift in JavaScript version management, introducing features such as classes, promises, arrow functions, ES modules, generators and iterators.

Feb 15, 2025 pm 12:13 PM
Destructuring Objects and Arrays in JavaScript

Destructuring Objects and Arrays in JavaScript

JavaScript deconstruction and assignment: simplify code and improve readability JavaScript's deconstructed assignment allows you to extract individual elements from an array or object using concise syntax and assign them to variables, simplifying the code and making it clearer and easier to read. Deconstruction and assignment are widely used, including processing API responses, functional programming, and in frameworks and libraries such as React. It can also be used for nested objects and arrays, default function parameters, variable value exchange, return multiple values ​​from a function, for-of loops, and regular expression processing. When using deconstructed assignments, you need to pay attention to the following: You cannot start a statement with curly braces, because it looks like a block of code. To avoid errors, either declare the variable or use brackets if the variable is declared

Feb 15, 2025 am 10:52 AM
What's New in ES2018

What's New in ES2018

ES2018 core improvements: asynchronous iteration, Promise.finally(), Rest/Spread attributes and regular expression enhancements ES2018 (also known as ES9) has brought several important updates to JavaScript, and this article will explain these new features and their applications through examples. The JavaScript standard (ECMAScript) continues to evolve, and after ES6 (ECMAScript 2015), the new annual release process accelerates the iteration of functions. ES2018 was the latest version at that time. TC39 (Technical Committee 39) is responsible for promoting JavaScript proposals, and the process is as follows: Stage 0: Preliminary concept. Stage 1:

Feb 15, 2025 am 08:37 AM
How to Beat 5 Common JavaScript Interview Challenges

How to Beat 5 Common JavaScript Interview Challenges

Coding Challenges in Technical Interviews: Full Preparation and Effective Response The coding process in technical interviews has always been controversial, especially in the front-end field, where some questions are weakly related to daily work. However, many companies still stick to this kind of screening method, and they value candidates' logical thinking, problem-solving ability and creativity rather than simply technical proficiency. This article will explore how to effectively deal with five common JavaScript/front-end junior engineer interview coding challenges. Interview preparation strategy: Full preparation: Prioritize learning of knowledge points that you are not familiar with, and conduct a lot of handwritten code exercises to simulate the whiteboard interview environment. Platforms such as GeeksforGeeks and Pramp are good practice resources. Clear understanding of the problem:

Feb 14, 2025 am 09:26 AM
Build a Countdown Timer in Just 18 Lines of JavaScript

Build a Countdown Timer in Just 18 Lines of JavaScript

Building a JavaScript countdown clock is sometimes necessary, whether it is an event, a promotion or a game. You can build the clock using native JavaScript without relying on any plugins. While there are many excellent clock plugins, using native JavaScript has the following advantages: The code is lightweight and has zero dependencies. The website performs better without loading external scripts and stylesheets. With more control, you can precisely control the behavior of the clock without trying to flex the plug-in to suit your needs. Here is how to create your own countdown clock with just 18 lines of JavaScript code: To gain an in-depth understanding of JavaScript, please read our book "JavaScript:

Feb 10, 2025 am 10:59 AM
Understanding Python Regex Functions, with Examples

Understanding Python Regex Functions, with Examples

Python regular expressions beginner: efficient text processing tools This article will take you into the deep understanding of Python regular expressions and learn how to use the re module to process text data efficiently. We will cover core functions, matching object methods, and practical tips to help you easily deal with various text processing scenarios. Core points: Python mainly uses the built-in re module to handle regular expressions, which are powerful and easy to use. Key functions include re.search() and re.match() for finding patterns, re.findall() for extracting all matches, re.sub() for replacing substrings, and re.compil

Feb 09, 2025 am 11:10 AM
Quick Tip: Testing if a String Matches a Regex in JavaScript

Quick Tip: Testing if a String Matches a Regex in JavaScript

Core points JavaScript's test() method is a practical tool to check if a string matches regular expressions. This method accepts a string as an argument and returns a Boolean value indicating whether the string matches the regular expression. Regular expressions in JavaScript are useful for detecting information in strings that can be written in different formats (such as dates, URLs, emails, etc.). They provide more flexible string testing conditions than methods such as indexOf(). Other methods for JavaScript regular expression matching include match, search, and exec. These methods are used to retrieve characters that match regular expressions.

Feb 09, 2025 am 10:39 AM
Quick Tip: How to Use the Spread Operator in JavaScript

Quick Tip: How to Use the Spread Operator in JavaScript

This tutorial will explain the various uses of extension operators in JavaScript, as well as the main differences between extension operators and remaining operators. The JavaScript extension operator is represented by three dots (...) and is introduced in ES6. It can expand elements in collections and arrays into single elements. Extended operators can be used to create and clone arrays and objects, pass arrays as function parameters, delete duplicates in arrays, and more. Key Points The JavaScript extension operator is represented by three dots (...). Introduced in ES6, elements in sets and arrays can be expanded into single elements. It can be used to create and clone arrays and objects, pass arrays as function parameters, delete duplicates in arrays, etc.

Feb 09, 2025 am 09:58 AM
5 Exciting New JavaScript Features in 2024

5 Exciting New JavaScript Features in 2024

2024 JavaScript core features for the future This article will dive into the highly anticipated new JavaScript features of 2024, which are most likely to be included in this year's ECMAScript version: Temporal, pipeline operators, records and tuples, regular expressions/v flags, and decorators. ECMAScript Update Since the ES6 update, a new JS version has been released every year, and this year's ES2024 version is expected to be released around June. ES6 is a huge version update, six years after its predecessor ES5. Browser manufacturers and JavaScript developers are all overwhelmed by a large number of feature updates. To avoid this happening again,

Feb 08, 2025 pm 01:40 PM
Quick Tip: How to Trim Whitespace with PHP

Quick Tip: How to Trim Whitespace with PHP

This article will discuss several methods and application scenarios for removing the beginning and end spaces of strings in PHP. Spaces in a string usually refer to spaces at the beginning or end. (The spaces between words are also spaces, but this article mainly focuses on the beginning and end spaces.) In PHP string processing, the beginning and the end spaces often cause trouble. Removing spaces can effectively clean and standardize data. The importance of removing spaces Give an example of the importance of removing spaces: Suppose that a user name is stored in the database, and a user accidentally adds a space at the end of the user name. This can cause problems with search or sorting. Use the trim() function to remove the beginning and end spaces to ensure that all usernames in the database are consistent in format and are easier to handle. Remove empty space when processing text-based data formats such as XML or JSON

Feb 08, 2025 am 11:34 AM
PHP Authorization with JWT (JSON Web Tokens)

PHP Authorization with JWT (JSON Web Tokens)

Application authentication used to rely solely on credentials such as username/mailbox and password, and the session was used to maintain user status until the user logged out. After that, we started using the authentication API. Recently, JSON Web Tokens (JWT) are increasingly used to authenticate server requests. This article will introduce what JWT is and how to use PHP for JWT-based user request authentication. Important points Evolution of authentication methods: This article outlines the evolution of user authentication methods, from traditional sessions to using JSON Web Tokens (JWT), highlighting the transition to a more secure and efficient way of user authentication and session management for web applications. . JWT's Excellence

Feb 08, 2025 am 09:57 AM
Quick Tip: How to Filter Data with PHP

Quick Tip: How to Filter Data with PHP

Key Points Never trust external input in the application. It is crucial to filter any data contained in your application to prevent attackers from injecting code. The two main types of data filtering in PHP are verification and cleaning. Verification ensures that external inputs meet expectations, while cleaning removes illegal or unsafe characters from external inputs. PHP provides a range of filters for verification and cleaning. These filters can be applied using the filter_var() and filter_input() functions to make your PHP applications safer and more reliable. This article will explore why anything contained in a filter application is so important. In particular, we will look at how to verify and clean external data in PHP

Feb 08, 2025 am 09:14 AM

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