The difference between jquery and dom

With the continuous development of web technology, many tools, frameworks and libraries have emerged in the field of front-end development to help developers complete tasks faster. Among these tools and frameworks, jQuery is one of the most popular. When developing with jQuery, people often hear a term: DOM. What is the difference between DOM and jQuery? This article will explore the differences between jQuery and DOM.

What is DOM?

DOM is the abbreviation of Document Object Model, which means document object model. The DOM defines a standard way to access elements, attributes, and content in HTML and XML documents. In the DOM, all elements in an HTML or XML document are represented as objects, so that they can be accessed and manipulated using programming languages ​​such as JavaScript.

DOM is maintained and developed by W3C (World Wide Web Consortium). The DOM interface defines a standard set of methods and properties that allow developers to create, delete, and modify HTML and XML elements in Web pages. By using the DOM, developers can dynamically update and change the content and style of web pages, enabling a richer and interactive user experience.

What is jQuery?

jQuery is a fast, concise JavaScript library originally created by John Resig in 2006. jQuery simplifies JavaScript programming, making it easier for developers to manipulate HTML documents, handle events, handle animations, AJAX asynchronous requests, and more.

jQuery developers have created a large number of plug-ins that make it easy to add animation effects, carousels, pop-ups, waterfall layouts, and more. jQuery also supports new features of CSS3 and HTML5, making it easier for developers to use these new technologies to create better web applications.

Differences between jQuery and DOM

jQuery and DOM are both tools for manipulating HTML (and XML) documents, but there are some differences between them.

1. How to write code:

When using jQuery to write JavaScript code, you need to introduce the jQuery library at the head of the page and use the jQuery selector to select HTML elements, for example:

var myElement = $(‘#myId’);

In contrast, writing JavaScript code using DOM requires obtaining HTML elements through JavaScript before use, for example:

var myElement = document.getElementById(‘myId’);

2. Code readability:

jQuery syntax Compared with DOM, which is simpler and easier to read, we can easily operate multiple elements through jQuery's chain syntax, which will also make the code more readable.

3. Performance:

Although both jQuery and DOM can accomplish the same function, jQuery usually improves the performance of web applications more than using DOM. This is because jQuery has been optimized for common operations that require a lot of code to complete when using the DOM.

Conclusion

DOM and jQuery are both tools for manipulating HTML documents, but there are some differences between them. Although jQuery is slightly more complex, it offers better readability and higher performance, helping developers write high-quality code faster. In contrast, using DOM can make the code simpler and easier to operate. Therefore, the choice of which tool to use depends on your specific development needs.

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