What does eq refer to in jQuery?

eq in jQuery is a method used to select the element at the specified index position in the matched element collection. The function is to obtain the corresponding DOM element by specifying the index value of the element and package it as a jQuery object. return.

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

In jQuery, `eq()` is a method used to select the element at a specified index position in the set of matched elements.

The function of this method is:

Get the corresponding DOM element by specifying the index value of the element, and wrap it as a jQuery object and return it.

Usage as follows:

```javascript
$('selector').eq(index)
```

where `'selector'` is the selector of the element collection to be filtered (required), `index` is the index value of the element to be obtained (required) ).

For example, the following code will get the third child element of all `ul` elements in the document and change its CSS style:

```javascript
$('ul').eq(2).css('color', 'red');
```

Explain, `$('ul')` All `ul` elements will be obtained, `.eq(2)` selects the third one (index starts from 0), which is a specific item in the list, and finally passes `.css('color', 'red')` Font color changed.

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