To what extent does JavaScript have to be learned?

getting Started? primary? intermediate? advanced?

Javascipt is an object- and event-driven programming language with front-end development as its main application area. Javascript (JS) is widely used in many fields such as web page interaction design, data visualization, web application development, mobile application development, desktop application development, and game development. If you are learning JS, you may ask: "To what extent is it considered to have learned JS?"

First of all, let's take a look at the basic knowledge of JS, which is something that must be mastered in the process of learning JS. These basic knowledge include: variables, operators, functions, conditional statements, loop statements, DOM, events, etc. Only by mastering these basic knowledge can you further learn the advanced content of JS.

Beginner JS learners need to understand the basic syntax of JS and how to embed JS into HTML pages to control the display, hiding, addition and modification of the page. Beginners also need to know how to use JS's conditional statements if/else and loop statements while/for to implement basic functions such as floating windows and navigation menus.

In the initial stage of JS, you need to have a deep understanding of the concepts of JavaScript objects and functions and their applications, and you also need to understand how to use HTML DOM API and CSS to operate web page elements. In addition, beginners learning JS also need to understand how to use the JS event mechanism to achieve user interaction, how to use AJAX technology to load data asynchronously, etc.

Once you have mastered the basic knowledge of JS and have elementary JS programming skills, you will enter the intermediate learning stage of JS. At the intermediate level, you will learn JS data structures and algorithms, modular programming, ES6 syntax features, and how to use libraries and frameworks. Intermediate JS learners also need to have an in-depth understanding of advanced concepts such as common objects, prototypes, inheritance, and closures, and be proficient in asynchronous programming technologies such as Promise, Generator, and async/await. In addition, at the intermediate level, you also need to learn in depth the techniques of JS animation effects and how to use JS debugging tools to diagnose and solve code problems.

Advanced JS learners need to master deeper and more advanced JS technologies and be able to apply these technologies to solve complex problems. Advanced JS learners need to be familiar with multiple patterns, frameworks, and libraries, such as React, Vue, AngularJS, etc. In addition, advanced learners also need to have an in-depth understanding of JS operating mechanism and memory management, as well as how to use advanced JS technology to improve page performance.

In general, JavaScript is developing very rapidly and requires continuous learning and progress. The level of JS learning varies from person to person, but on the premise that you fully master the basic knowledge, you can further improve your programming skills and master more advanced JS knowledge and techniques, then you can truly learn JS.

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