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The core JS roundup every React developer should master

The core JS roundup every React developer should master

ToworkeffectivelywithReact,youmustmasterthreecoreJavaScriptconcepts:1.Scopeandclosures,whicharecriticalforunderstandinghowfunctionscapturevaluesinReactcomponents,particularlywithhookslikeuseEffectanduseCallback—alwaysincludeallreactivedependenciesoru

Jun 28, 2025 am 01:00 AM
What are JavaScript Generators and how do they work?

What are JavaScript Generators and how do they work?

JavaScriptGenerator is a special function introduced by ES6. It can pause execution multiple times through the yield keyword and return value as required. It returns an iterator object, and calls the .next() method to gradually get the value. For example, function*myGenerator(){yield1;yield2;yield3;} defines a generator, calling gen.next().value returns 1, 2, and 3 in turn. Its core mechanism is lazy evaluation and state retention, which is suitable for processing infinite sequences, custom iterators, process control and data flow processing. When using it, you should pay attention to its non-array characteristics, and you should not abuse it and you should master the timing of parameter passing.

Jun 28, 2025 am 12:56 AM
How do top-level await in modules work?

How do top-level await in modules work?

Top-levelawaitinJavaScriptallowstheuseofawaitdirectlyatthetoplevelofamodule,outsideofanyasyncfunction,makingtheentiremodulebehavelikeanasyncfunction.1.ItpausesmoduleexecutionuntiltheawaitedPromiseresolves,ensuringthatimporteddataisfullyresolvedbefore

Jun 28, 2025 am 12:50 AM
await Modules
A JS roundup on improving performance with Web Workers

A JS roundup on improving performance with Web Workers

The key to improving performance of WebWorkers is to move heavy tasks to background threads. The core points include: 1. Clearly run APIs (such as setTimeout, fetch, IndexedDB) and limited functions (such as DOM operations); 2. Efficiently pass messages through postMessage, avoid redundant data and utilize structured cloning; 3. Splitting time-consuming tasks (such as image processing) from the main thread to keep the UI smooth; 4. Keep Worker scripts concise and focused, and reuse on demand rather than repetitive creation. The rational use of WebWorkers can significantly optimize application response speed.

Jun 28, 2025 am 12:44 AM
An advanced JS roundup on performance optimization tips and tricks

An advanced JS roundup on performance optimization tips and tricks

TooptimizeJavaScriptperformance,focusonrenderingoptimization,memoization,andlazyloading.1.Optimizerenderingbyusingdebouncetodelayfunctionexecutionuntilafterapauseineventsliketyping,andthrottletolimithowoftenafunctionrunsduringfrequenteventslikescroll

Jun 28, 2025 am 12:43 AM
How to handle keyboard events in JavaScript?

How to handle keyboard events in JavaScript?

HandlingkeyboardeventsinJavaScriptinvolvesusingkeydown,keyup,andkeypress.1)UseaddEventListenertocapturekeypressesondocumentorfocusedelements.2)Preferevent.keyoverkeyCodeforreadability.3)DetectmodifierkeyslikeCtrlorShiftviaeventproperties.4)Managekeyr

Jun 28, 2025 am 12:40 AM
A helpful JS roundup to finally understand the 'this' keyword

A helpful JS roundup to finally understand the 'this' keyword

The pointing of this in JavaScript depends on the way the function is called. 1. In the global context, this points to the global object (window in the browser and global in Node.js), but undefined in strict mode; 2. When calling the method, this points to the object that calls the method, and if the method is called separately, the context will be lost; 3. When using the new keyword in the constructor, this points to the newly created object, and the arrow function cannot be used as a constructor; 4. In the processing of DOM events, this usually points to the element that triggers the event, and the arrow function inherits the outer layer of this; 5. The value of this can be manually specified through call, apply or bind, and

Jun 28, 2025 am 12:35 AM
How long does it take to learn js?

How long does it take to learn js?

LearningJavaScriptcantakeaslittleasafewweeksforbasicslikevariablesandfunctions,butreachingproficiencywithmodernframeworksmaytakemonths.Startwithfundamentals—variables,conditionals,loops,arrays,objects—usingfreeresourceslikeMDNorCodecademy,practicing2

Jun 28, 2025 am 12:07 AM
Study time
How to detect a click outside a specific DOM element?

How to detect a click outside a specific DOM element?

To detect whether a click occurs outside of a specific DOM element, a common method is to listen to the document and use contains() to determine the target node. The specific steps are as follows: 1. Add a click event listener through document.addEventListener; 2. Get the target element in the callback function and use element.contains(event.target) to determine the click position; 3. If false is returned, it means that the click is external; 4. It is recommended to use the capture stage to avoid conflicts with internal element events; 5. When uninstalling the component, the listener must be removed to prevent memory leakage.

Jun 28, 2025 am 12:05 AM
What is a js library and which one should I learn?

What is a js library and which one should I learn?

JavaScript library is a pre-written collection of code used to help developers complete common tasks efficiently. Its core functions include: 1. Simplify DOM operations; 2. Handle user interaction; 3. Send HTTP requests. Popular JS libraries include: 1.jQuery is suitable for small projects or legacy systems; 2.React is suitable for building dynamic user interfaces; 3.Vue.js is suitable for progressive integration; 4.Axios simplifies API calls. Learning suggestions: 1. If you want to master the basics, you must first learn native JS; 2. jQuery is available for small websites; 3. React is the first choice for modern front-end development; 4. Axios can be selected only if you need API calls. It is recommended that most developers give priority to learning React, but the premise is to master variables and cycle

Jun 27, 2025 am 01:28 AM
How does lazy loading images or components improve performance?

How does lazy loading images or components improve performance?

Lazyloadingimproveswebpageperformancebydeferringnon-criticalresourcesuntilneeded.1.Itreducesinitialloadtimebyloadingonlyvisiblecontent,suchasimagesinagalleryoritemsinalist,whiletherestloadsonscroll.2.Itlowersbandwidthusagebypreventingunusedcontentfro

Jun 27, 2025 am 01:25 AM
Performance optimization Lazy loading
Java vs Javascript: easy guide

Java vs Javascript: easy guide

Java and JavaScript are two different programming languages. 1.Java is used for enterprise-level applications and Android development, with static typing and cross-platform features. 2. JavaScript is mainly used for front-end development, dynamic type, and is suitable for dynamic web pages and Node.js. There are significant differences in syntax, execution environment, use, and performance between the two.

Jun 27, 2025 am 01:24 AM
How to Use Data Types in JavaScript: A Practical Tutorial

How to Use Data Types in JavaScript: A Practical Tutorial

JavaScriptdatatypescanbeusedeffectivelybyunderstandingtheiruniquepurposesandfollowingbestpractices.1)Useprimitivetypeslikenumber,string,boolean,undefined,null,symbol,andbigintforspecificscenarios.2)HandlenumberprecisionissueswithtoFixedorMath.round.3

Jun 27, 2025 am 01:23 AM
What Symbols Are Used for JavaScript Comments?

What Symbols Are Used for JavaScript Comments?

JavaScriptuses//forsingle-linecommentsand//formulti-linecomments.1)Single-linecommentsareidealforbriefnotes.2)Multi-linecommentsallowfordetailedexplanations.3)Commentsshouldprovidecontext,notrepeatcode.4)Avoidover-commentingself-explanatorycode.5)Hig

Jun 27, 2025 am 01:21 AM

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