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Therefore, the developer tends to ask questions such as "What version of ECMAScript does this browser support?" Or what ECMAScript function does this browser support? They questioned whether Google, Mozilla, and Microsoft began updating the browser's JavaScript engine using the features described in the latest ECMAScript I thought. The JavaScript runtime is an "existing entity or system" mentioned in the script language definition. The code passes through the JavaScript engine, and when analyzed and understood, the entity or system performs the interpreted operation. A dog walks or runs, a character of a video game jumps (a wrecking ship in the case of the above image)

Let's see now. The first reason for this is that, unlike most languages ​​on the server (including Node.js), the version of JavaScript you can run depends on the particular browser version. If your users (you want to keep) are still in IE, you can use the latest browser. For example, if you want to write A {} class, you are not fortunate. Some users will receive SyntaxError and white pages. In addition, Babel (as it is used by the community) has places in the future that will affect the JavaScript language itself. Since it is a tool for converting JS code, it can also be used to implement suggestions submitted to TC 39 (Ecma Technical Committee 39, group promoting JavaScript as standard).

The server is part of the software on the machine that can respond to requests. That word sounds really scary, but that is something like this. For example, if you type Google.com in your browser, it recognizes that the browser sends a request to Google's server and Google's server recognizes how to respond to such request and provides a Google home page. One thing to note: Since the server knows how to respond to requests, any computer can be a server, a client, or both. You can write code to run the local server on your computer while requesting to install the browser and act as a client. Is not that interesting?