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⭐ Column introduction
Front-end Getting Started Tour: Exploring the Wonderful World of Web Development Welcome to the Front-End Getting Started Tour! If you are interested, you can subscribe to this column! This column is tailor-made for those who are interested in web development and have just entered the front-end field. Whether you are a complete novice or a developer with some basic knowledge, here will provide you with a systematic and friendly learning platform. In this column, we will update it every day in the form of questions and answers, presenting you with selected front-end knowledge points and answers to frequently asked questions. Through the Q&A format, we hope to respond more directly to readers’ questions about front-end technology and help everyone gradually establish a solid foundation. Whether it's HTML, CSS, JavaScript, or various common frameworks and tools, we'll explain concepts in a simple and easy-to-understand way, and provide practical examples and exercises to solidify what you've learned. At the same time, we will also share some practical tips and best practices to help you better understand and apply various technologies in front-end development.
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Today’s content:Virtual DOM of the front-end framework
Virtual DOM of the front-end framework (Virtual DOM)
In front-end development, virtual DOM is a technology used to improve page performance, usually used with front-end frameworks (such as React, Vue, etc.). The following explains the concept and working principle of virtual DOM.
1. What is virtual DOM?
Virtual DOM is an in-memory virtual tree structure that uses JavaScript objects to simulate the DOM structure of the entire page. By maintaining this virtual DOM, the framework can update and render pages more efficiently.
2. Working principle:
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Initialization phase:
- When the page loads, the framework uses JavaScript to create a virtual DOM tree whose structure corresponds to the actual DOM structure.
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Status change:
- When the page state changes (for example, user interaction results in data changes), the framework will generate a new virtual DOM tree to represent the new page state.
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Virtual DOM Diff:
- The framework will compare the old and new virtual DOM trees, find the differences between them (Diff algorithm), and obtain a series of operations that need to be updated.
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Update the actual DOM:
- The framework uses the difference information to update only the parts that really need to change, rather than the entire page. This can reduce the number of actual DOM operations and improve performance.
3. Why use virtual DOM?
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Performance optimization:
- Actual DOM operations are relatively expensive, while virtual DOM comparisons and updates are performed in JavaScript memory, with less performance overhead. By minimizing actual DOM manipulation, page rendering performance can be improved.
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Cross-platform development:
- The concept of virtual DOM makes it easier for front-end frameworks to achieve cross-platform development. For example, React Native uses virtual DOM to generate native UI on mobile.
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Simplify the development process:
- Virtual DOM allows developers to focus more on the state and logic of the application without having to pay too much attention to the operation of the DOM. The framework is responsible for optimizing the rendering process.
4. Disadvantages of virtual DOM:
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learning curve:
- The introduction of virtual DOM increases a certain learning cost. Developers need to understand the concept of virtual DOM and the working principle of the framework.
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Added runtime overhead:
- Although virtual DOM can improve performance to a certain extent, in some cases, it may increase some runtime overhead.
Overall, virtual DOM is an important feature in modern front-end frameworks. It improves application performance and development efficiency by optimizing the page update process.
⭐Write at the end
This column is suitable for a wide range of readers, and is suitable for front-end beginners; or those who have not learned front-end and are interested in front-end, or back-end students who want to better show themselves and expand some front-end knowledge points during the interview process, so If you have the basics of front-end and follow this column, it can also help you to a great extent to check for omissions and fill in the gaps. Since the blogger himself does the content output, if there are any flaws in the article, you can contact me through the left side of the homepage. , let’s make progress together, and at the same time, I also recommend several columns to everyone. Interested partners can subscribe: In addition to the columns below, you can also go to my homepage to see other columns;
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