What is the meaning of jquery object

The jQuery object refers to the object returned containing these DOM elements and their related properties and methods after using the selector in the jQuery library to select one or more DOM elements. Its function is similar to that in JavaScript. array or object. In other words, a jQuery object is a virtual object containing DOM elements and has a series of operable methods that can perform a certain task or obtain the corresponding attribute value for each element.

Operating system for this tutorial: Windows 10 system, jQuery3.6.0 version, Dell G3 computer.

The jQuery object refers to using the selector (`$()` function) in the jQuery library to select one or more DOM elements. The returned object includes these DOM elements and their related attributes and method object. It works like an array or object in JavaScript.

In other words, a jQuery object is a virtual object that contains DOM elements. It has a series of operable methods that can perform a certain task or obtain the corresponding attribute value for each element.

One of the most common ways to obtain jQuery objects is through the `$()` function:

//javascript
$(selector)

where `selector` is a CSS selector that can match a group or an HTML Elements (such as: ".class", "#id", "element")

For example, get the jQuery objects of all elements with class example:

//javascript
var $exampleElements = $('.example');

Then you can `$exampleElements` executes some methods provided by jQuery, for example:

//javascript
// 在所有被选元素中隐藏第一个元素
$exampleElements.first().hide(); 
// 修改所有被选元素的 HTML 内容为 Hello World!
$exampleElements.html('Hello World!');

It should be noted that if you use native JS to obtain the DOM element, you cannot directly call the method in jQuery, and you must convert it into jQuery Object

Here is an example:

//html


  
列表项1
  
列表项2
  
列表项3

//javascript
// 获取所有 
 元素的 jQuery 对象
var $lis = $('li');
// 调用方法修改列表项文本内容和样式
$lis.html('这是一个列表项').css('color', 'red');

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