The difference between jquery3.0 and 2.0

With the continuous development of front-end technology, jQuery has become the preferred framework for the vast majority of web developers. Currently, the latest version of jQuery is 3.0, which has some major differences and changes from previous versions. Therefore, this article will detail the differences between jQuery 3.0 and 2.0 and their impact on developers.

1. jQuery 3.0 supports ES6/ES2015 syntax
   An important change in jQuery 3.0 is that it begins to support ES6/ES2015 syntax. ES6 is the sixth version of the ECMAScript standard and provides many new features, such as arrow functions, classes, and modular syntax. In versions before jQuery 3.0, only ES5 syntax is supported and ES6 syntax cannot be used. But now, developers can use the new features of ES6 to write code in jQuery, thereby improving the readability and maintainability of the code.
2. jQuery 3.0 has removed some obsolete APIs
   In order to maintain the simplicity and compatibility of the code, jQuery 3.0 has removed some obsolete APIs, such as .context and . size()etc. These APIs were marked as obsolete in previous versions and have been completely removed in version 3.0. If your code uses these APIs, you need to make corresponding modifications.
3. jQuery 3.0 has made improvements to Ajax requests
   In jQuery 3.0, some improvements have been made to Ajax requests, including supporting binary data transmission and improving the security of cross-domain requests. jQuery 3.0 uses XMLHttpRequest Level 2 for Ajax requests, which makes it easier for developers to request data across domains.
4. jQuery 3.0 improves the event binding and triggering mechanism
   In jQuery 3.0, the event binding and triggering mechanism has been improved. The new API makes the code simpler, clearer and has better performance. At the same time, jQuery 3.0 supports the Promise/A specification, which improves the processing capabilities of asynchronous event processing.
5. jQuery 3.0 adds some new APIs
   In addition to removing obsolete APIs, jQuery 3.0 also adds some new APIs, such as $.when() and .toArray()etc. These new APIs make it easier for developers to write elegant code and improve code readability and maintainability.

In short, compared with jQuery 2.0, jQuery 3.0 has been greatly improved in terms of syntax support, API improvements, performance, etc. These changes may require some learning and adaptation for developers. However, these changes also bring developers a better programming experience and better development efficiency, and improve the readability and maintainability of the code. Therefore, we have reason to believe that as time goes by, more and more developers will choose to upgrade to jQuery 3.0.

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