The difference between jquery3.0 and 2.0

jQuery is a very famous JavaScript library that can provide a fast, concise, cross-browser JavaScript programming experience. In this article, we will focus on the differences and changes between jQuery 3.0 and 2.0.

History of jQuery

To delve into the differences between jQuery 3.0 and 2.0, we first need to understand the history and development of jQuery. Since its first release in 2006, jQuery has exploded in popularity among the web development community, especially for handling DOM manipulation. Version 1.x has been the most supported version until 2014, when the first major version update, 2.x, was released. Currently, the latest stable version is the 3.x series.

The main differences between jQuery 2.0 and jQuery 3.0

Although they look similar, there are actually many differences between jQuery 3.0 and 2.0. Here are some of the most important ones:

1. Support for new JavaScript API

jQuery 3.0 supports new JavaScript APIs (such as Promises), which makes asynchronous coding simpler. Versions 2.0 and earlier did not support these APIs, so developers were forced to use old-school callback techniques.

2. Fixed some bugs

jQuery 3.0 fixes some bugs that existed in 2.0, and also resolves some of the compatibility issues with browsers. In addition, the new version also fixes some security vulnerabilities, which makes it more reliable and secure.

3. Removed support for IE6/7/8

jQuery 3.0 will no longer support older versions of IE browsers. Although 2.0 also gave up support for IE6/7/8, in order to be compatible with web applications of IE8 and below, 2.0 also provides an IE-compatible version. Therefore, if your application needs to run in an older version of IE, then you should use version 2.0.

4. More optimized selector engine

jQuery 3.0’s selector engine has been improved, which makes it perform better when processing large documents. The selector engine in 2.0 was already excellent, but improvements in 3.0 further improve performance.

Conclusion

While 2.0 and 3.0 look similar, there are clear differences between them. 3.0 is a major update that fixes some security vulnerabilities, adds some new features, and provides better support for the modern JavaScript API. If your application needs to run in an older version of IE, you may need to use version 2.0. Apart from that, we recommend using the latest jQuery 3.0 as it has better performance and more powerful features while also improving the reliability and security of web applications.

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