What does it mean in jquery-Front-end Q&A-php.cn

In jQuery, what does the $ symbol mean

jQuery is an easy-to-use Javascript library that allows developers to easily obtain the Document Object Model (DOM) across browsers by using specific functions To simplify the operation of HTML, CSS and JavaScript in web pages. Compared with other JavaScript libraries, jQuery has better compatibility, better performance, higher scalability and smaller size.

When using jQuery, a very important symbol is "$". This symbol is the abbreviation of jQuery. You can use "$" to perform operations related to jQuery, including reading and modifying the attributes of elements and Style, realize dynamic interaction, etc. Using the "$" symbol can greatly simplify the writing and operation of code, making it more convenient for developers to write and debug code.

In jQuery, the "$" symbol can be thought of as a wrapper for a function, used to perform various operations. This function can be used in many different ways, and it can change its functionality by passing different parameters, for example:

Selector

Use the "$" symbol You can use selectors to select elements on the page. For example:

$('div') // Select all

elements on the page

Variables

Use the "$" symbol , you can also convert an element object into a jQuery object for easy operation. For example:

var element = document.querySelector('div'); // Get a

element
$(element) // Convert the

element into a jQuery object

DOM operation

jQuery can perform DOM operations very conveniently. When using the "$" symbol, you can quickly obtain the attributes of the element or modify the style of the element. For example:

$('div').attr('class', 'newClass'); // Modify the class attribute of the

element to 'newClass'
$('div') .css('color', 'red'); // Set the text color of the

element to red

In short, the $ symbol is the core of jQuery, which can greatly simplify the writing and operation of code. Make it easier for developers to write and debug code. If you are using jQuery, please make good use of the $ symbol to make your code more elegant and efficient.

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