How to write jquery class selector

jQuery is a powerful JavaScript library that easily implements the selection and operation of DOM elements through selector classes. In jQuery, a selector is a string used to select DOM elements, and a class selector is one type of selector. Let's take a detailed look at how to write class selectors in jQuery.

1. Basic syntax of class selector

The class selector selects elements through the class name in CSS. In jQuery, the class selector uses "." as the selector, followed by the class name. You need to add "." before the class name.

For example, if you want to select elements with class "box", the syntax is as follows:

$(".box")

2. Combination use of class selectors

In addition to using class selectors alone, You can also combine class selectors with other selectors to achieve more accurate selection results. The following are examples of common combinations of class selectors:

1. Class selectors are used in combination with tag selectors

You can use a combination of tag selectors and class selectors To select tags of a specified class, for example, select all div tags with class "box", the syntax is as follows:

$("div.box")

2. Use the class selector in combination with the ID selector

When you need to select elements that have both specified class and ID attributes, you can use a combination of class selector and ID selector. For example, to select an element with class "box" and ID "test", the syntax is as follows:

$("#test.box")

3. Class selector is used in combination with attribute selector

Sometimes it is necessary To select elements with a specified class and specific attributes, you can use a combination of class selector and attribute selector. For example, to select a tag whose class is "box" and whose href attribute contains "baidu", the syntax is as follows:

$("a.box[href*='baidu']")

3. Summary

The above is how to use the class selector. Through class selectors, we can easily select an element or a group of elements and operate them. It should be noted that the "." symbol needs to be added before the class name to comply with CSS writing rules.

In addition to class selectors, there are other types of selectors in jQuery, such as ID selectors, attribute selectors, sub-element selectors, etc. They can implement more practical selection functions and help more Quickly and accurately manipulate DOM elements.

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