Foreword
Personal opinions for your reference
Opinions are derived from the author’s usage experience and daily research
The ranking is based on the popularity of the framework, grammatical structure, ease of use and other features
I hope you can find the framework that suits you best based on this video
The following are strictly front-end frameworks and libraries

Top5: Polymer
Polymer is an open source project led by the front-end development team within the Google Chrome organization. The project's slogan is: [UseThePlatform]. The team believes that embracing the modern Web platform is the key to providing users and developers with The best way to apply. This producer introduces the following features of Polymer:
Web Components: Web component API based on W3C standards.
Using native browser technology: Web components are embedded in native browsers, so there is no need for third-party libraries like jQuery, dojo, etc., and they can work seamlessly with other Web components.
Behaviors : Its unique Behaviors to share Web components and declare their properties.
Encapsulation: It can encapsulate code and structure into the same location.
Custom Elements: Developers can customize elements, add tags and attributes

##Polymer
- Efficient productivity: Its friendly API and ergonomic design concept allow developers to quickly complete the build work
- Name Conventions: Ember uses naming conventions that minimize code-saving abbreviations Everything you need to build production-ready web applications
- Rich plugins: Ember provides a rich set of plugins to easily share common code between applications
- Handlebars integrated template: can automatically update when the underlying data changes, which can greatly reduce the amount of code
- ##Ember

AngularJS was originally developed by Misko Hevery and Adam Abrons in 2009 and later became a Google project. AngularJS makes up for the shortcomings of HTML in building applications. It expands the HTML vocabulary in web applications by using identifier (directives) structures, allowing developers to use HTML to declare dynamic content, thus making web development and testing work easier. Easier.
Full-featured framework: with HTML module, its unique modularity, automated two-way data binding, semantic tags, dependency injection and other attributes. Especially suitable for heavyweight applications Development.
- Very popular: Firstly it is maintained by Google. Secondly because Angular is part of the MEAN full stack
- Angular CLI: Just need You can build an Angular project by mastering a few commands
- TypeScript: Angular is written in TypeScript by default, which is more friendly to developers who like TypeScript.
- Use Ionic framework: Ionic framework is used to build Hybrid App, which is currently the most promising HTML5 mobile application development framework.
- Angular

React originated as an internal project of Facebook. In recent years, React has transformed from the earliest UI engine into a complete set of front-end and back-end Web App solutions. The concept of React is: [Learn once, write everywhere]
- Flux&Redux: Although React is in the view layer Run in , but you can also use Flux and Redux
- to create responsive applications: React provides responsive view components and its own command line
-
- ##React
Top1: Vue.js
Vue.js is a progressive JavaScript framework. Unlike other heavyweight frameworks, Vue adopts a bottom-up incremental development design. Vue’s core library Focusing only on the view layer, it is not only easy to get started, but also easy to integrate with third-party libraries or existing projects.
Simple: Compared with other frameworks, it has a friendlier learning curve, only users Anyone with basic knowledge of HTML and JavaScript can learn to use Vue
Flexible & Highly Productive: The template function has been added in the Vue2.0 version, its simple and compact core, progressive The technology stack can handle all applications.
Fast speed: Vue’s virtual DOM is well optimized and very fast, especially suitable for developing applications with higher requirements for data visualization and animation. Medium.
- ##v-model & 2 way data binding: You can use v-model and 2 way model for data binding
- Vue- CLI: Vue has its own command line, and deploying Vue is much simpler than Angular.
##Vue.js
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JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.


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