What does the $ sign do in jquery?
php Write your review! Spit it out, see everything Member Login | User Registration recommended reading php The meaning of the word 盚 is named in the pronunciation of the Xinhua Dictionary. Basic wording explanation… [detailed] Crayon Shinchan 2023-08-27 11:43:18 php How do static methods access non-static methods in php The content of this article mainly explains “how to access non-static methods in static methods in php”, interested friends may wish to take a look. The method described in this article is simple, quick and practical. Next, let the editor take you… [detailed] Crayon Shinchan 2023-08-27 11:42:55
What is fragment in react?
fragment is a component in react, its role is to replace div as the outer layer, and it can be used as an invisible wrapping element. When defining a component, the return return requires a unique root element, so a div is often written to wrap it, but if you don’t want to render this div and reduce dom rendering, you can refer to the Fragment component. Recommended tutorial: “React Video Tutorial” fragment is a component in react, which is used to replace div as the outer layer. Make invisible wrapping elements. A component in React often returns multiple elements. At the same time, React requires that these elements must be wrapped under one element. The most common way is to use wrapping. The problem with this is that a lot of unnecessary nesting is added, which virtually increases the rendering pressure of the browser. From react 16, render supports returning an array: import React from 'react'; export default function () { return [ step 01, step 02, step 03, step 04 ]; } At the same time, another method is provided, which is Fragments. When we define a component, the return return requires a unique root element, so we…
What is the difference between jquery and document to get html elements?
jquery html Write your review! Spit it out, see everything Member Login | User Registration recommended reading firefox html ajax implements ntlm, and it only takes one page to get NTLM challenge from an AJAX POST It’s rather mysterious here. I have an ASP.NET MVC4 web application using Windows Authentication that I have maintained for 18+ months with no issues. Recently, it was deployed… [detailed] Crayon Shinchan 2023-08-27 11:19:45 dom Share 167 PHP source codes, there is always one suitable for you PHP source code share 167 PHP source codes, there is always one suitable for you. The following is the name of the file. I put some pictures. Not all pictures in the article are mainly because they cannot be put down. … [detailed] Crayon Shinchan 2023-08-27 11:01:33
How does jquery remove css styles?
jquery css Write your review! Spit it out, see everything Member Login | User Registration recommended reading iframe layui implements a modal box function similar to bootstrap I was used to the modal box of bootstrap before, but suddenly changed to layui, thinking of using layui to realize the modal box function similar to bootstrap. The layer module of layui is used, for example: <!D … [detailed] Crayon Shinchan 2023-08-27 10:37:08 icons Some Atom plugins for front-end development Original link: awesome-atom-packages This is a list of Atom plugins for web developers. With the help of these plugins, Atom can provide us with IDE-like functionality. New to Atom? Syntax support… [detailed] Crayon Shinchan 2023-08-27 10:21:01
Understanding Object Prototypes and Prototype Chains in JavaScript
This article will introduce you to object prototypes and prototype chains in Javascript. There is a certain reference value, and friends in need can refer to it, and I hope it will be helpful to everyone. Object prototype I believe everyone has used map like this: let arr = [0, 1, 2] let doubleArr = arr. map(c => c * 2) console.log(doubleArr) // 0, 2, 4 I don’t know if you have thought about it, arr itself does not set the map attribute , then why can we use the map function? Print it out to see: console.log(arr) // 0: 0 // 1: 1 // twenty two // length: 3 // __proto__: Array(0) There is an object named __proto__, if you expand it, you will see all the functions that can be used by Array objects; of course We can also find the map function in it, and this is the arr.map function called in the example: console.log(arr.map === arr.__proto__.map) // true The __proto__ object that appears here is the so-called Prototype. Different from Java, C# and other class-based (Class) object-oriented languages, properties and methods are passed by defining classes, creating instances, specifying inheritance, etc.; Javascript is a Prototype-based pairing…
Understand how asynchrony is handled in JavaScript
In website development, asynchronous events are a part of the project that must be dealt with, and because of the rise of front-end frameworks, SPA implemented through frameworks is already a standard configuration for quickly building websites. It has become an indispensable part; this article will talk about the asynchronous processing method in Javascript. Synchronization? asynchronous? First of all, of course, we must first understand what synchronous and asynchronous mean. These two nouns are always confusing for beginners. After all, the literal meaning of Chinese is easy to be reversed. It is doing one thing at a time, and asynchronous is the processing of many things together in parallel. For example, when we go to the bank to handle business, queuing in front of the window is synchronous execution, and getting the number to do other things first is asynchronous execution; through the characteristics of Event Loop, asynchronous events in Javascript can be executed Easy to say So what is the way to handle asynchronous events in Javascript? Callback function What we are most familiar with is the callback function. For example, the event listener registered when the web page interacts with the user needs to receive a callback function;…
5 TypeScript Design Patterns You Need to Know
This article introduces 5 TypeScript design patterns. There is a certain reference value, and friends in need can refer to it, and I hope it will be helpful to everyone. Design patterns are templates that help developers solve problems. There are too many patterns covered in this book, and they often target different needs. However, they can be divided into three distinct groups: Structural patterns deal with relationships between different components (or classes) and form new structures, to provide new functionality. Examples of structural patterns are Composite, Adapter, and Decorator. Behavioral patterns abstract the common behavior between components into an independent entity. Examples of behavioral patterns are commands, policies, and one of my personal favorites: the Observer pattern. Creation mode focuses on the instantiation of classes, making it easier for us to create new entities. I’m talking about factory methods, singletons and abstract factories. Singleton pattern The singleton pattern is probably one of the most famous design patterns. It is a creational pattern because it ensures that no matter how many times we try to instantiate a class, we only have one instance available. Singleton patterns for handling things like database connections, since we want to handle one at a…
Understanding Readable Streams in NodeJS
What is a readable stream A readable stream is used for production data A stream for program consumption. Our common data production methods include reading disk files, reading network request content, etc. Let’s take a look at the example of stream usage introduced earlier: const rs = fs.createReadStream(filePath); rs is a readable stream, the way to produce data is to read disk files, our common console process.stdin is also a readable stream: process.stdin.pipe(process.stdout); You can print out the console input through a simple sentence, process.stdin The way to generate data is to read user input at the console. Look back at our definition of readable streams: readable streams are streams that produce data for program consumption. Custom readable stream In addition to the fs.CreateReadStream We also often use the src method provided by gulp or vinyl-fs gulp.src(['*.js', ' 39;dist/**/*.scss']) If we want to produce data in a specific way and hand it over to the program for consumption, how do we start? Just two simple steps Inherit the Readable class of the sream module Rewrite _read method, call this.push to put the produced data into the queue to be read The Readable class has completed most of the work to…
How does require() work in Node.js? Working principle introduction
php Write your review! Spit it out, see everything Member Login | User Registration recommended reading select easyUI: ComboTree and comselector use instance analysis ComboTree usage scenario: As the name implies, ComboTree is a combination of combo and Tree, which is triggered when a certain node value needs to be obtained through selection. Chestnut: Definition: Use labels to create a tree drop-down box. Use Ja… [detailed] Crayon Shinchan 2023-08-27 11:48:00 select Languages for Small Web Development 1. What language is the overall structure of Diandian.com written in? I have played wordpress before, which is based on php. I think dynamic web pages are very interesting. I want to do some work in this area in the future; I hope to analyze the mainstream language What are the advantages of each website. (If possible … [detailed] Crayon Shinchan 2023-08-27 11:47:53
