Why does the CSS framework require JS support?

Title: Reasons why the CSS framework cannot be separated from the support of JS and analysis of code examples

Abstract:
This article will explain to readers why the CSS framework cannot be separated from the support of JS JavaScript support and specific code examples are provided for analysis. The combination of CSS framework and JavaScript brings more interactivity and dynamic effects to web design, providing users with a better experience.

1. Basic introduction to CSS framework
CSS framework is a front-end development tool based on CSS (Cascading Style Sheets), which is used to simplify and accelerate the design process of web pages. Common CSS frameworks include Bootstrap, Foundation, and Semantic UI.

2. Why does the CSS framework need the support of JS

1. Responsive design: The CSS framework can implement responsive design through media queries, allowing web pages to adapt to different devices and screen sizes. . In order to make responsive design more intelligent and flexible, JS support is necessary. Through JS scripts, CSS styles can be dynamically changed according to the width and height of the device to achieve a more refined responsive effect.

Code example:

In the above example, when the width of the browser window is greater than 768px, the background color of the box will change to blue; when the width of the browser window is less than or equal to At 768px, the background color of the box will change to red.

2. Scrolling effect: Many CSS frameworks support page scrolling animation effects, such as smooth scrolling, gradient scrolling, etc. The realization of these effects cannot be achieved without the support of JS. Monitor page scrolling events through JS scripts, and then change CSS styles according to the scrolling position to achieve richer and cooler scrolling effects.

Code example:

In the above example, when the scroll distance of the page exceeds 500px, the background color of the box will gradually turn to blue; when the scroll distance is less than or equal to 500px, the background color of the box The background color will fade to yellow.

3. Conclusion
This article explains to readers why the CSS framework is inseparable from the support of JS from two aspects: responsive design and scrolling effect, and provides specific code examples for analysis. The combination of CSS framework and JS brings more interactivity and dynamic effects to web design, improving the user experience. Readers should make full use of the combination of CSS framework and JS to create a more attractive and creative web design based on their own needs and project characteristics.

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