##The difference between Bootstrap3 and Bootstrap4
First introduce the official website connection of Bootstrap3 and 4;Bootstrap3 VS Bootstrap4.
Differences
Four types of grids for Bootstrap3:
Extra small (col-xs-) Suitable for mobile phones (
Small (col-sm-) Suitable For tablets (≥768px)
Medium (col-md-) For computers (≥992px)
Large (col-lg-) For widescreen computers (≥1200px)
Five types of grids for Bootstrap4:Extra small (col-) (
Small (col-sm-) (≥576px)
Medium (col-md-) (≥768px)
Large (col-lg-) (≥992px)
Extra large (col-xl-) (≥1200px )
Bootstrap4 FeaturesThe new grid layer is adapted to the mobile terminal;
Comprehensive introduction of ES6 new features (rewriting all JavaScript plug-ins) ;
css files have been reduced by at least 40%;
All documents are rewritten with Markdown editor;
Abandon support for IE8
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Bootstrap is an open source front-end framework developed by the Twitter team to simplify and speed up the web development process. 1.Bootstrap is based on HTML, CSS and JavaScript, and provides a wealth of components and tools for creating modern user interfaces. 2. Its core lies in responsive design, implementing various layouts and styles through predefined classes and components. 3.Bootstrap provides predefined UI components, such as navigation bars, buttons, forms, etc., which are easy to use and adjust. 4. Examples of usage include creating a simple navigation bar and advanced collapsible sidebar. 5. Common errors include version conflicts, CSS overwrites and JavaScript errors, which can be used through the version management tool.

Bootstrap can be integrated in React in two ways: 1) CSS and JavaScript files using Bootstrap; 2) Use the React-Bootstrap library. React-Bootstrap provides encapsulated React components, making using Bootstrap in React more natural and efficient.

There are two ways to use Bootstrap components in React projects: 1) CSS and JavaScript of the original Bootstrap; 2) Use libraries designed specifically for React such as react-bootstrap or reactstrap. 1) Install Bootstrap through npm and introduce its CSS file in the entry file, and then use the Bootstrap class name in the React component. 2) After installing react-bootstrap or reactstrap, directly use the React components it provides. Use these methods to quickly build a responsive UI, but pay attention to style loading and JavaScript

Bootstrap is an open source front-end framework that simplifies web development. 1. It is based on HTML, CSS, JavaScript, and provides predefined styles and components. 2. Use predefined classes and JavaScript plug-ins to implement responsive layout and interactive functions. 3. The basic usage is to introduce CSS and JavaScript files, use classes to create navigation bars, etc. 4. Advanced usage includes custom complex layouts. 5. Check the introduction of class names and files during debugging and use developer tools. 6. The optimization suggestion is to only introduce necessary files, use CDN, and use LESS or Sass when customizing.

How to create responsive web applications using Bootstrap and React? By combining Bootstrap's CSS framework and React's componentized architecture, modern, flexible and easy to maintain can be created. The specific steps include: 1) Importing the CSS file of Bootstrap and using its class to style React components; 2) Using React's componentization to manage state and logic; 3) Loading Bootstrap styles as needed to optimize performance; 4) Creating a dynamic interface using React's Hooks and Bootstrap's JavaScript components.

Bootstrap is an open source front-end framework that helps developers quickly build responsive websites. 1) It provides predefined styles and components such as grid systems and navigation bars. 2) Implement style and dynamic interaction through CSS and JavaScript files. 3) The basic usage is to introduce files and build pages with class names. 4) Advanced usage includes custom styles through Sass. 5) Frequently asked questions include style conflicts and JavaScript component issues, which can be solved through developer tools and modular management. 6) Performance optimization is recommended to selectively introduce modules and rationally use grid systems.

React and Bootstrap are ideal combinations. 1) Use Bootstrap's CSS classes and JavaScript components, 2) integrate through React-Bootstrap or reactstrap, 3) load and optimize rendering performance on demand, and build an efficient and beautiful user interface.


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