How to dynamically modify css style

In web application development, dynamically modifying CSS styles is a very useful skill. By dynamically modifying CSS styles, we can change the appearance and layout of the web page without changing the HTML code. This article will introduce the basic method of using JavaScript and jQuery libraries to dynamically modify CSS styles.

Use JavaScript to dynamically modify CSS styles

It is very simple to use JavaScript to dynamically modify CSS styles. We can use the document.querySelector() and document.querySelectorAll() methods to select the elements to be modified. We can then access and modify CSS styles using the element's style property.

Accessing CSS styles

Accessing CSS styles is very simple. We only need to use the style attribute of the element and access the attribute name of the CSS style to be modified. For example, we can use the following code to access and modify the text color of an element:

//选择要修改的元素
var element = document.querySelector('h1');

//访问元素的文本颜色
var color = element.style.color;

//修改元素的文本颜色
element.style.color = 'red';

Modify CSS style

Modifying CSS style is also very simple. We just need to use the style attribute of the element and set the attribute name and attribute value of the CSS style we want to modify. For example, we can use the following code to modify the font size and background color of an element:

//选择要修改的元素
var element = document.querySelector('h1');

//修改元素的字体大小
element.style.fontSize = '24px';

//修改元素的背景颜色
element.style.backgroundColor = 'yellow';

Use the jQuery library to dynamically modify CSS styles

In addition to using JavaScript, we can also use the jQuery library To dynamically modify CSS styles. jQuery is a popular JavaScript library that encapsulates commonly used DOM operations and provides concise syntax and cross-browser support.

Accessing CSS styles

It is also very simple to access CSS styles using jQuery. We only need to use the css() method to read or modify the style of an element. This method accepts a CSS style name as a parameter and returns the attribute value of the style. For example, we can use the following code to access and modify the text color of an element:

//选择要修改的元素
var element = $('h1');

//访问元素的文本颜色
var color = element.css('color');

//修改元素的文本颜色
element.css('color', 'red');

Modify CSS styles

Modifying CSS styles using jQuery is also very simple. We only need to use the css() method to set the attribute name and attribute value of the CSS style to be modified. For example, we can use the following code to modify the font size and background color of an element:

//选择要修改的元素
var element = $('h1');

//修改元素的字体大小
element.css('font-size', '24px');

//修改元素的背景颜色
element.css('background-color', 'yellow');

Summary

This article introduces the basic method of using JavaScript and jQuery libraries to dynamically modify CSS styles. Whether using JavaScript or jQuery, both methods are very simple and make it easy to dynamically modify the appearance and layout of the web page. Therefore, it is very important to master the skills of dynamically modifying CSS styles in web development.

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