jquery dynamically adds css styles

In web development, CSS style is one of the important components of web design. Through CSS styles, we can add styles to web page elements, define layout and typography, etc.

In the actual development process, we often need to dynamically add CSS styles to achieve specific effects. In this case, jQuery provides a rich API that allows us to easily implement the function of dynamically adding CSS styles. Next, this article will briefly introduce how to use jQuery to dynamically add CSS styles.

1. Use the css() method to set CSS styles

jQuery provides a method called css(), which can be used to set and get the CSS style of an element. The following sample code shows how to use the css() method to dynamically set CSS styles:

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

Among them, selector can be any valid jQuery selector, property represents the name of the CSS property to be set, and value represents the CSS property. value. For example, if you want to set the font color of an element to red, you can use the following code:

$("#elementId").css("color","red");

In the above code, the $("#elementId") selector is used to select the element with the ID "elementId". And use the .css() method to dynamically set its font color to red.

2. Use the attr() method to set CSS styles

In addition to the css() method, jQuery also provides an attr() method, which can be used to set the attributes of the element. This also includes CSS style properties. With this method, we can easily set the inline style of the element.

The following code shows how to use the attr() method to set the CSS style of an element:

$(selector).attr("style","property:value");

Among them, selector is also any valid jQuery selector, and "property:value" indicates the value to be set. CSS style properties and values. For example, if you want to set the border color of an element to blue, you can use the following code:

$("#elementId").attr("style","border-color: blue;");

3. Dynamicly add CSS stylesheet

In addition to the above two methods, jQuery A method of dynamically adding a CSS style sheet is also provided, which adds a new

The following code shows how to use jQuery to dynamically add a CSS style sheet:

$("head").append("<style> #elementId { color: red; } </style>");

In the above code, the

element is selected using the $ function and is added to it through the .append() method. A new

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