Vue3 Advanced: Understand some differences between Vue2 and Vue3 and the relationship between Vue.js and Node.js

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The relationship and role of Node.js and Vue.js

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Original text of this article: Vue3 Advanced: Find out some differences between Vue2 and Vue3 and the relationship between Vue.js and Node.js

Vue.js is a popular front-end framework that has now reached its third major version, Vue 3. There are many similarities and differences between Vue 2 and Vue 3. These similarities and differences will be summarized in detail below.

Vue3 is an important version of the Vue.js framework. It introduces many new features and improvements, making Vue.js more efficient, flexible, easy to use and maintainable. I recommend that everyone use this version in future projects.

In this article, I will first introduce the characteristics of Vue.js, and then summarize some similarities and differences between Vue2 and 3, so that developers can have a preliminary understanding of the differences between using Vue2 and 3. Then I'll go into more detail about the relationship between Vue.js and Node.js and their roles in web development.

Features of Vue.js

Vue.js is a lightweight, efficient front-end framework that is widely used in web development. It has many powerful features that enable developers to build interactive user interfaces more efficiently. The following will summarize some features of Vue in detail.

1. Responsive data binding: Vue uses a data hijacking and observation mechanism to achieve automatic synchronization of data and views through two-way binding. When the data changes, the view automatically updates, greatly simplifying the development process.

2. Component-based development: Vue provides a component-based development method, dividing the page into multiple independent components, each component has its own state and view. Components can be nested, reused, and communicate easily, improving the maintainability and reusability of the code.

3. Virtual DOM: Vue uses virtual DOM to improve rendering performance. When the data changes, Vue will first generate a virtual DOM tree, then use the Diff algorithm to find the parts that need to be updated, and finally update only these parts, avoiding unnecessary DOM operations and improving performance.

4. Template syntax: Vue’s template syntax is concise and clear, similar to HTML. Expressions, instructions and filters can be used directly in the template. Template syntax allows developers to quickly write pages, and also provides some special instructions and syntactic sugar to facilitate developers to handle complex logic and interactions.

5. Life cycle hooks: Vue provides a series of life cycle hook functions that can perform corresponding operations at different stages of the component. Developers can perform data initialization, asynchronous requests, DOM operations, etc. in hook functions to flexibly control the behavior of components.

6. Plug-in system: Vue has a rich plug-in ecosystem that can extend its functionality. Developers can install plug-ins to add additional features, such as routing, state management, form validation, etc.

7. Rich tool integration: Vue is equipped with a series of tools, such as Vue Devtools, Vue Router, Vuex, etc., which can help developers better debug, manage and expand Vue applications.

8. Progressive framework: Vue is a progressive framework, and its features can be gradually applied according to the needs of the project. Developers can choose to use only Vue's core functionality, or combine it with other libraries and tools to build more complex applications.

Summary of similarities and differences between Vue2 and 3

Next, I will summarize the main 10 differences. I will introduce these new features in detail with examples in subsequent articles, as follows:

ecosystem

In Vue 2, a large and stable ecosystem has been formed, with a large number of third-party libraries and plug-ins available. In Vue 3, due to version updates, some third-party libraries and plug-ins may need to be adapted to be compatible with the new features of Vue 3.

Responsive system

Vue 2 uses Object.defineProperty to implement a responsive system, while Vue 3 uses Proxy. The Proxy object allows the creation of a proxy that can intercept and customize various operations on the object, which makes Vue 3's reactive system more efficient and has better performance.

render function

Vue 2 mainly uses template-based rendering, that is, writing Vue templates to describe the structure and logic of components. Vue 3 introduces the rendering function API, which allows us to directly write JavaScript code to generate virtual DOM, thereby more flexibly controlling the rendering of components.

Component instance

In Vue 2, component instances are implemented through Object.defineProperty. In Vue 3, Proxy-based responsive component instances are used, which makes the creation and update of component instances more efficient and reduces some unnecessary overhead.

Global API

Global APIs in Vue 2 (such as Vue.directive, Vue.filter, Vue.component, etc.) need to be accessed through Vue objects. In Vue 3, these global APIs are removed and a more flexible modular approach is used for registration and import. In addition, Vue 3 also introduces some new global APIs, such as createApp, provide/inject, etc.

translater

Vue 2 uses a string-based template compiler, which has some limitations. In Vue 3, a tag-based compiler is used to better support new features such as JSX and TypeScript.

Type support

Vue 2 has weak type support and requires additional tools (such as TypeScript plug-ins) to implement type checking. Vue 3 introduces native TypeScript support, providing complete type definition and type derivation, allowing developers to enjoy better type checking and code prompts.

Performance optimization

Vue 3 further improves performance through a series of optimizations, such as static tree promotion, provider caching, etc. Compared with Vue 2, Vue 3 has significantly improved in terms of virtual DOM rendering speed and component initialization speed.

API design

Vue 3 provides a more flexible and maintainable way of writing components by introducing the Composition API. Vue 2 uses an optional API, which may cause component code to become lengthy and difficult to maintain when dealing with complex logic.

Composition API

Vue 3.0 introduces the Composition API, a brand-new API used to better organize and manage the logic of components. Compared with the optional API in Vue 2, the Composition API allows us to combine functionally related codes to form one or more custom Hook functions and reuse them in components. The Composition API provides finer-grained control and greater code reusability, making code more readable and maintainable.

Of course, there are many other differences between Vue 2 and Vue 3. Vue 3 introduces many new features and optimizations, such as Composition API, Proxy responsive system, rendering function API, native TypeScript support, etc., making development more efficient and flexible. However, due to version updates, when upgrading to Vue 3, you need to pay attention to ecosystem compatibility and some API changes. All in all, Vue 3 is a more powerful and efficient framework that is worth trying and using by developers.

The relationship and role of Node.js and Vue.js

Vue.js and Node.js are two very popular technologies in web development. Although they both belong to the JavaScript ecosystem, they play different roles in different areas.

In the previous series of Node.js articles , more than 40 articles have been used to introduce a considerable part of Node.js in detail. For details, you can follow the public account CTO Plus to read more articles about Node.js. If you have any questions, please welcome the backend Leave messages to communicate.

Next, I will introduce the relationship between Vue.js and Node.js and their roles in web development.

Vue.js

Vue.js is a JavaScript framework for building user interfaces. Its main goal is to make building interactive web interfaces easier by providing an easy-to-use API and responsive data binding. Vue.js adopts a component-based development method, allowing developers to split the interface into independent components, each component has its own state and behavior.

Core features of Vue.js include:

Responsive data binding: Vue.js uses a mechanism called "responsive". When the data changes, related interface elements will automatically update.

Component development: Vue.js allows developers to split the interface into independent components. Each component has its own state and behavior. Complex interfaces can be built by combining components.

Virtual DOM: Vue.js uses virtual DOM to improve rendering performance, minimizing actual DOM operations by comparing differences in virtual DOM.

Template syntax: Vue.js provides a concise and clear template syntax for declaring the structure and data binding of the interface.

Vue.js is usually used to build a single page application (SPA) or a component in a page. It can be used with other libraries or frameworks such as Vue Router and Vuex to meet more complex application needs.

Node.js

Node.js is a JavaScript runtime environment based on the Chrome V8 engine, which allows JavaScript code to run on the server side. Node.js adopts an event-driven and non-blocking I/O model, making it very suitable for handling high-concurrency network applications.

Core features of Node.js include:

Event-driven: Node.js uses an event-driven approach to handle requests and responses, by registering event listeners to handle asynchronous operations.

Non-blocking I/O: Node.js uses a non-blocking I/O model, which can handle multiple requests at the same time, improving application throughput and performance.

Modularization: Node.js supports modular development. You can introduce other modules through the `require` keyword and export modules using the `exports` keyword.

Node.js is commonly used to build server-side applications, command line tools, back-end APIs, etc. It provides a wealth of built-in modules and third-party modules that can easily handle tasks such as file system operations, network requests, and database connections.

Vue.js and Node.js play different roles in web development:

Vue.js is mainly used to build client user interfaces. It is responsible for handling tasks such as interface rendering, data binding, and componentization. Vue.js code will be executed in the browser.

Node.js is mainly used to build server-side applications. It is responsible for processing requests and responses, database operations, file system operations and other tasks. Node.js code will be executed on the server.

One is the front-end framework (Vue.js), and the other is the server-side language runtime environment (Node.js).

Node.js is a JavaScript runtime environment based on the Chrome V8 engine. Use an event-driven, non-blocking I/O model to make it lightweight and efficient.

Vue.js is a progressive framework for building data-driven web interfaces. The goal of Vue.js is to implement responsive data binding and composed view components through the simplest possible API. Not only is it easy to get started, it is also easy to integrate with third-party libraries or existing projects. When combined with single-file components and libraries supported by the Vue ecosystem, Vue is also fully capable of powering complex single-page applications (SPAs).

Although Vue.js and Node.js play different roles in web development, there is some overlap between them. For example, you can use Node.js as the back-end server for Vue.js applications, providing data interfaces and processing business logic. In addition, Vue.js's build tools and packaging tools can also be run in the Node.js environment for building and deploying Vue.js applications. Both Vue.js and Node.js can use npm as a package manager, npm is the world's largest open source library ecosystem.

To sum up, Vue.js and Node.js are two very important technologies in web development. Vue.js is used to build client-side user interfaces, while Node.js is used to build server-side applications. They play different roles in different areas, but can also be used in combination to meet complex web application needs.