How to select all subclasses in jquery

When we need to find all child elements of a DOM element, we can use the selector in jQuery to achieve this. Selectors for selecting child elements include descendant selectors, child element selectors, adjacent sibling selectors, and universal sibling selectors. These selectors and how to use them are introduced below.

1. Descendant selector

The descendant selector is one of the most commonly used selectors in jQuery. It searches for all its child elements by specifying the parent element. Descendant selectors use a space ( ) to separate two element names.

For example, the following selector will select all em elements under all elements with class box:

$(".box em")

2. Child element selector

Child element selector Its function is to specify the direct relationship between parent elements and child elements. Only child elements can be found but not grandchild elements. The child element selector uses a greater than sign (》) to separate two element names.

For example, the following selector will select all direct child elements h3 elements under all elements with class box:

$(".box > h3")

3, adjacent sibling selector

The neighbor selector looks for sibling elements that are adjacent to an element. It uses a plus sign ( ) to separate two element names.

For example, the following selector will select the first p element immediately following the element with id item:

$("#item + p")

4. Universal sibling selector

General The sibling selector is similar to the adjacent sibling selector, but it can select all p elements after the element with id item, not just the first one.

$("#item ~ p")

To sum up, jQuery provides a variety of ways to select child elements. By appropriately selecting different selectors, we can achieve full control over DOM elements and more easily perform page interaction and animation control.

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