Detailed explanation of how jQuery modifies CSS styles

With the development of front-end technology, jQuery has gradually become one of the tools widely used by developers. Its powerful DOM manipulation and CSS selector functions have greatly simplified the work of developers, especially on pages. In terms of processing, you can easily count and modify the attributes of page elements to achieve the final page effect.

This article will focus on the application of jQuery in modifying CSS, showing readers the core ideas and processes, so that readers can quickly get started with practical applications in future work.

1. Basic concepts

When using jQuery to modify CSS styles, you need to understand some basic concepts:

1. Selector (selector): used to select the desired Modified elements generally use class selectors, id selectors, tag selectors, etc.
2. Attribute: The attribute of the element to be modified, such as width, height, background-color, etc.
3. Value (value): The value to modify the attribute, for example, modify the width to 100px.

2. Modify CSS style

2.1 Modify a single CSS style

If you want to modify a single CSS style, you can use the following method:

$("selector").css("property", "value");

Among them, "selector" represents the element selector to be modified, "property" represents the attribute name to be modified, and "value" represents the attribute value to be modified.

For example, we want to change the background-color of the element with the id "first" to red. The code is as follows:

$("#first").css("background-color", "red");

2.2 Modify multiple CSS styles

If you want To modify multiple CSS styles, you can use the following method:

$("selector").css({property1: value1, property2: value2, ...});

Among them, "selector" represents the element selector to be modified, "property1" and "property2" represent the attribute names to be modified, "value1" and "value2" represents the modified attribute value.

For example, we want to change the font-size of the element with the id "first" to 14px and the background-color to red. The code is as follows:

$("#first").css({ "font-size": "14px", "background-color": "red" });

2.3 Modify the CSS class

In addition to the above-mentioned direct modification of the CSS style of the element, we can also indirectly modify the CSS style by adding or deleting classes for the element.

To add a class, you can use the following code:

$("selector").addClass("classname");

Among them, "selector" represents the element selector to be modified, and "classname" represents the class name to be added.

For example, we want to add the class name "highlight" to the element with the id "first", the code is as follows:

$("#first").addClass("highlight");

To delete the class, you can use the following code:

$("selector").removeClass("classname");

where , "selector" indicates the element selector to be modified, and "classname" indicates the class name to be deleted.

For example, we want to delete the class name "highlight" from the element with the id "first", the code is as follows:

$("#first").removeClass("highlight");

3. Summary

This article mainly introduces the use of jQuery in The application of modifying CSS styles, I hope it will be helpful to readers. In practical applications, readers should use the above methods flexibly and modify CSS styles according to page requirements.

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