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Course Introduction：Bootstrap picture centering tips: Basics: Flexbox and Grid systems are used for layout, and text-center only centers the text baseline horizontally. Horizontal centering: Use justify-content-center attribute (Flexbox), or abuse margin: 0 auto; (unstable). Vertical centering: same as above, add align-items: center; the parent container needs to be set to fixed height. Responsive design: Use responsive classes to control layouts under different screen sizes. Common errors: Forgot to set height, abuse margin, ignore responsive design. Performance optimization: Select the appropriate image format, compress the image volume, and avoid excessively large images. **

2025-04-07 comment 0  853

Course Introduction：Overview: There are many ways to center images using Bootstrap. Basic method: Use the mx-auto class to center horizontally. Use the img-fluid class to adapt to the parent container. Use the d-block class to set the image to a block-level element (vertical centering). Advanced method: Flexbox layout: Use the justify-content-center and align-items-center properties. Grid layout: Use the place-items: center property. Best practice: Avoid unnecessary nesting and styles. Choose the best method for the project. Pay attention to the maintainability of the code and avoid sacrificing code quality to pursue the excitement

2025-04-07 comment 0  718

Course Introduction：Why use nested columns? What are the unique advantages of nested columns in Bootstrap? Nested columns are used because it provides flexible layout control and responsive design capabilities. 1) Nested columns allow further subdivision of content within the main column, suitable for complex layouts. 2) The nested column width can be adjusted under different screen sizes to optimize the user experience. However, care should be taken to avoid over-necking to keep the code concise and performance optimization.

2025-06-06 comment 0  579

Course Introduction：The responsiveness of the centered Bootstrap image depends on the specific situation. text-center is only valid for in-line elements, while mx-auto needs to rely on the width of the parent element, which may cause the image to be centered and distorted. The best way to achieve responsive image centering is to use container elements to set width and mx-auto for horizontal centering, or use the Bootstrap grid system to finely control the layout. A common mistake is to use text-center or mx-auto directly on the image. For performance optimization, appropriate image sizes should be used and best practices should be followed. Understanding principles rather than blindly using classes will help avoid traps and write efficient code.

2025-04-07 comment 0  301

Course Introduction：Developers like to use Bootstrap because it can save time and improve efficiency, has a built-in responsive design, and is compatible with mainstream browsers. 1. Provide ready-made components such as buttons, navigation bars, modal boxes, etc., which are used directly without writing from scratch; 2. The grid system is based on flexbox, supports responsive layout, and is adapted to different devices; 3. It handles cross-browser compatibility issues and reduces the risk of style confusion. Core functions include: CSS style library, grid system, JavaScript plug-ins, and tool classes. When using it, you need to introduce CSS and JS files. It is recommended to load it through CDN. You can directly copy the official document code using components, and you can also customize the theme style through Sass. Frequently asked questions for beginners include forgetting to load JS, version differences, and style impulse

2025-06-29 comment 0  896

Course Elementary  13774

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82283

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13145

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24591

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27449

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.