jquery.com

One-line Overview

jQuery is an open-source JavaScript library created by American developer John Resig, designed to simplify HTML document traversal, event handling, animation, and Ajax interactions. With its “write less, do more” philosophy, it quickly became an essential foundational tool for front-end developers worldwide, and it is still widely used today in many legacy projects and lightweight websites.

Business Details

jQuery is not a commercial company, but a community-maintained open-source project first released in 2006. Its core value lies in abstracting away differences between browsers, allowing developers to manipulate the DOM and handle events through a unified API, greatly lowering the barrier to entry for JavaScript. In the early days of chaotic browser compatibility, jQuery was almost the default standard for front-end development. Today, although modern browsers’ native APIs are already powerful enough, jQuery still plays an important role in many legacy systems, WordPress themes, and pages that need simple interactions implemented quickly. Its user base ranges from individual blog developers to large enterprise IT departments—virtually any web front-end project may still involve jQuery.

Who It’s Best For

• Front-end beginners: One of the best entry-level tools for learning DOM manipulation and event handling, with abundant community resources.
• Maintaining legacy projects: Many large websites or enterprise systems built before 2015 still rely on jQuery for maintenance and feature expansion.
• Rapid prototyping: When you need to quickly implement page interactions such as carousels or tabs, the jQuery plugin ecosystem can significantly shorten development time.
• WordPress theme developers: WordPress includes jQuery by default on the back end, and many themes and plugins depend on it.
• Small projects that do not require extreme performance: For simple websites that do not need complex frameworks like React or Vue, jQuery remains a lightweight option.

Key Features and Highlights

• Simplified DOM manipulation: Use the $() selector and chainable calls to quickly find, modify, add, or remove page elements.
• Cross-browser compatibility: Automatically handles API differences in older browsers such as IE6/7/8, eliminating the need to manually write compatibility code.
• Unified event handling: Provides methods such as on() and off() to standardize event binding, delegation, and removal.
• Ajax wrapper: Functions such as $.ajax(), $.get(), and $.post() greatly simplify writing asynchronous data requests.
• Animations and effects: Built-in methods such as fadeIn(), slideUp(), and animate() make it easy to implement basic animations.
• Rich plugin ecosystem: jQuery-based plugin libraries, such as jQuery UI and jQuery Mobile, cover common needs like form validation, date pickers, and charts.

Pricing Analysis

jQuery is completely open-source and free, released under the MIT license. Individuals, companies, and commercial projects can all use it freely without paying any fees. There are no hidden costs, paid editions, or subscriptions. The only “cost” is the time required to learn it and the effort needed to maintain dependencies. Compared with paid commercial UI libraries such as Ext JS or Kendo UI, jQuery has an absolute price advantage. That said, if performance optimization is a concern, you may need to use a minified version or load modules on demand—but none of this requires payment.

How Users in China Can Use It

• Network accessibility: jQuery CDN files from sources such as cdnjs or Google CDN may load slowly or fail in some network environments in China. However, there are multiple domestic mirrors, such as BootCDN, Staticfile CDN, and Qiniu CDN, that can provide stable access. You can also download the files directly and host them on a local server.
• Payment methods: No payment is required, so this is not applicable.
• Whether a VPN/proxy is needed: Access to the jQuery official website (jquery.com) and documentation (api.jquery.com) can occasionally be unstable in China, but day-to-day development can be handled through domestic mirrors or local documentation. IntelliSense in mainstream code editors such as VS Code is also usually enough to replace online documentation.
• Domestic alternatives: Zepto.js, which is lighter and designed for mobile; native JavaScript, as modern browsers already support most jQuery-like features such as querySelector and fetch. In addition, China has jQuery-based UI libraries such as layui, though they are not direct replacements.

Pros and Cons

Pros:

• ✅ Zero-cost usage: Open-source and free, with no commercial restrictions.
• ✅ Huge community: Massive numbers of tutorials, Q&A posts, and plugins; solutions to most problems are easy to find.
• ✅ Gentle learning curve: Intuitive syntax that helps beginners get started quickly.
• ✅ Good compatibility: Still offers solid support for older browsers such as IE8.
• ✅ Lightweight: Around 30KB when minified, with limited impact on page loading.

Cons:

• ❌ Behind in performance: Compared with modern native DOM APIs, some jQuery operations, such as selectors and animations, are less efficient.
• ❌ Can lead to bloated code: It is easy to write “spaghetti code,” which is not ideal for maintaining and testing large projects.
• ❌ Conflicts with modern frameworks: Mixing jQuery into frameworks such as React or Vue can lead to confusing state management.
• ❌ No longer actively evolving: The jQuery 3.x branch has not seen major updates for years, and the core team has shifted more attention to maintaining subprojects such as Sizzle.
• ❌ Uneven plugin quality: Many third-party plugins are no longer maintained and may have security vulnerabilities or compatibility issues.

Comparison with Similar Products

• Native JavaScript (Vanilla JS): Modern browser APIs can now cover more than 80% of jQuery’s functionality, while offering better performance and a smaller footprint. Best for developers pursuing maximum performance or using modern frameworks.
• Zepto.js: A lightweight jQuery alternative designed for mobile, with an API highly compatible with jQuery but a smaller size of around 10KB. It does not support older browsers. Suitable for mobile H5 pages.
• Alpine.js: A lightweight library closer to modern front-end framework thinking, using declarative syntax to implement interactions. Suitable for pages that need simple state management, though its learning curve is slightly steeper than jQuery’s.

Summary and Recommendation

jQuery is best suited for maintaining legacy systems developed before 2015, quickly building simple websites that do not require complex state management, serving as an entry-level tool for front-end beginners, and developing WordPress themes or plugins. It is not suitable for complex single-page applications that require high-performance interactions, new projects built with modern frameworks such as React or Vue, or mobile H5 pages that prioritize the fastest possible loading speed. For new projects, native JavaScript or a lightweight framework such as Alpine.js is generally recommended first. For existing projects, if you depend on jQuery plugins, it is reasonable to continue using it, but gradual migration to more modern solutions is advisable. Since jQuery is completely free, there is no payment issue to consider—you can simply download it or include it via CDN.