When a browser loads a page, it creates a DOM (Document Object Model). The HTML parser goes through the code and when it finds the JavaScript code, it hands this over to the JavaScript engine, as required. This engine loads external JavaScript files and code from the Internet, but does not immediately read the code – instead it waits until the HTML and CSS parsing is all read at the end. When this is done, JavaScript is executed in the order it was programmed on the web page. Variables and functions are specified, function calls are implemented, event handlers are activated.
The benefits of Javascript for you
Because so many people need JavaScript on the web, more and more since the 90s and early 2000s, its popularity among coders has grown exponentially. Currently it is probably the most popular language on the web. With the explosion in popularity of JavaScript and the increasing complexity of the web, Google released its Chrome browser and V8, an open-source engine for efficient execution of JavaScript code. With its release in 2008, it accelerated web page and JavaScript load speeds, and led to even more uses the following year. JavaScript has become the ideal language to compete on the web, that is to say on SEO. Its fast loading option has become one of its strong points. Not all modern web browsers can run JavaScript, adding complexity and programming logic to web design that was not possible with simple HTML.
Why should you learn JavaScript?
Ask as JavaScript is so popular in its use in websites, the demand for developers who know this programming language will continue to increase. It already surpasses its competitors in demand and has become the number one programming language used on the web. JavaScript developers earn better compensation than most other developers. As demand grows, salary levels are expected to be high over the coming years. Maturity – The language itself is maturing, with browsers increasingly able to handle JavaScript code. Not only that; The frameworks around JavaScript are also maturing, which means that JavaScript is on its way to being the future of enterprise application development.
So, to become a professional developer, or just to learn for the love of the web, JavaScript is simply essential, essential. It is easy to learn and offers you a multitude of possibilities.