What does dom mean in jquery

What does DOM mean in jQuery

jQuery is a popular JavaScript library that makes it very convenient to manipulate HTML and CSS documents to make them more dynamic and interactive. In jQuery, DOM is a core concept. How to understand and use DOM is particularly important in jQuery.

What is DOM?

DOM stands for Document Object Model, the application programming interface (API) for HTML and XML documents. It allows developers to use scripts to access and modify the content, structure, and style of documents, thereby bringing dynamic interaction to web pages.

Generally speaking, the browser parses the HTML or XML document into a DOM object tree, and then allows scripts to access and manipulate the DOM object tree. The DOM object tree consists of object nodes, which represent elements, attributes, or text in HTML or XML. The node tree structure is as shown in the figure:

In the DOM object tree, there are parent-child and sibling relationships between nodes. Through these relationships, we can traverse the DOM object tree and Make modifications or operations to the document.

The use of DOM in jQuery

In jQuery, operating the DOM object tree becomes more concise and easier to read. You can use selectors to select elements and use the API provided by jQuery to obtain their attributes, text, styles, etc. The following are some commonly used jQuery DOM operation methods:

• $(selector): Selector, selects one or more HTML elements and returns a jQuery object.
• $(selector).html(): Get or set the HTML content within the element.
• $(selector).text(): Get or set the text content within the element.
• $(selector).attr(): Get or set the attribute value of the element.
• $(selector).addClass(): Add a class name to the element.
• $(selector).removeClass(): Remove the class name from the element.
• $(selector).css(): Get or set the CSS style of the element.

For example, in an HTML document containing multiple buttons, we may need to use jQuery to style the buttons, add click events, etc. You can use the following code:

$(document).ready(function(){ $("button").addClass("btn-primary"); $("button").click(function(){ alert("按钮被点击了"); }); });

In the above code, we use the$("button")selector to select all button elements and passaddClass()Methods set their class name tobtn-primary. In addition, thealert()function is added through theclick()method to detect button clicks.

Conclusion

jQuery simplifies the operation of JavaScript in web pages, and provides some powerful APIs to help us operate HTML, CSS, DOM and other elements in web pages. Correctly understanding and using jQuery DOM manipulation methods can significantly improve our development efficiency and make our web pages more vivid and engaging.

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