What is JavaScript?

If you have used Browsers for Internet Browsing, then you must have seen the option to Enable JavaScript. Then you must have come to your mind what exactly is this JavaScript and why it is necessary to enable it. Well, to understand it in simple words, we can say that JavaScript is not the main programming language but it is a scripting language. It is used primarily in browsers and is used with HTML or CSS as well. Often people do not know the difference between JavaScript and Java and both of them start thinking the same. Well, it does not happen at all. Both of these languages are totally different.

JavaScript is a very commonly used client-side scripting language. Or we can say it is used in all major web browsers. It contains the largest library ecosystem in any programming language. Since this is a scripting language, its code can also be written in an HTML page. So when a user requests the HTML page, in which a JavaScript is present, then this script is sent to the browser and it depends only on the browser that they want to co-operate with it.

By the way, there is no relation between JavaScript and Java. Just because Java is used in its name, JavaScript is called: The World's Most Misunderstood Programming Language. JavaScript Official Name is ECMAScript defined under Standard ECMA-262.

What are the frameworks of JavaScript?

The frameworks that are used most often are React JS, Angular JS, Create JS, jQuery, NodeJS etc.

JavaScript introduction:

JavaScript is one of the 3 languages that all the web developers must learn from; let's also know about those three languages.

1. HTML is used to define the content of web pages.
2. CSS is used to specify the layout of web pages.
3. JavaScript is used to program Behavior of Web pages. Only web pages are not the only place where JavaScript is used. JavaScript is also used in many desktop and server programs. Node.js is such a program. In some databases, such as MongoDB and CouchDB, JavaScript is used according to their programming language.

Differences in Java and JavaScript:

Often people think that the difference between Java and JavaScript is the same. But there really is nothing like this. So let's know about the difference between these two. JavaScript is not exactly like Java. JavaScript and Java are different. Well, both of these names are very alternation, those who create a doubt in the minds of people. Where this language is primarily used on the basis of a scripting language, in HTML pages, Java is a real programming language which is used entirely in other work. Learning Java can be a bit daunting. It used to be developed by Sun Microsystems in all those things where computing power was needed.

JavaScript was developed by Brendan Eich, who used to work in Netscape at that time; they developed it at the end of a client-side scripting language. There is no such fundamental reason why it is in a server-side environment. Cannot be used.

Originally the name of this language was Live Script, but when it was about to be released, then Java was very popular. So in the last possible moment, Netscape changed its name to "JavaScript".

Both Java and JavaScript are C and C ++, but these languages work completely different from their ancestors. Both languages are object-oriented and yes they share some similar syntax too. But there are differences in it compared to similarities.

How to enable JavaScript?

Right now most web pages have JavaScript; this is a scripting programming language that runs in the visitor's web browser. This makes web pages functional for specific purposes, if they are disabled for some reason, then the content of Web Page or its functionality also becomes limited or unavailable.

In Google Chrome:

1. In your web browser's menu, click "Customize and control Google Chrome" and select "Settings".
2. In the "Settings" section, click on "Show advanced settings ...".
3. Click on "Privacy" in the "Content settings."
4. When the dialog window is open, you have to look at the "JavaScript" section and select "Allow all sites to run in JavaScript (recommended)".
5. Then click "OK" button to close it.
6. Then close the "Settings" tab.
7. Click on "Reload this page" button in your web browser where the page will be refreshed.

In Internet Explorer:

1. On the Web browser menu, click on the "Tools" icon and select "Internet Options".
2. On the "Internet Options" window, select the "Security" tab.
3. Click on the "Security" tab on the "Custom level" button.
4. When the dialog window of "Security Settings - Internet Zone" is open, you will have to go to the "Scripting" section.
5. In the "Active Scripting" item, select "Enable".
6. By doing so, a "Warning!" A window pops out in front of you asking, "Are you sure that you want to change this setting for this zone?" Select "Yes".
7. On the "Internet Options" window, click on the "OK" button to close it.
8. Then click on the "Refresh" button on the web browser from which the page will refresh again.

In Mozilla Firefox:

1. In the address bar, type about: config and press Enter.
2. Click "I'll be careful, I promise" if any warning message appears in front of you.
3. In the same search box, search javascript.enabled
4. Then Toggle "javascript.enabled" preference (right-click and select "Toggle" or double-click that preference) which you can change its value from "false" to "true".
5. Click the "Reload current page" button on the web browser to which you can refresh the page.

In Opera:

1. Click the Opera icon "Menu" and then "Settings".
2. Click "Websites" and then select "Allow all sites to run JavaScript (recommended)"
3. Click "Reload" button to refresh that page of a web browser.

In Apple Safari:

1. In your web browser menu, click on "Edit" and select "Preferences".
2. Select the "Preferences" window on the "Security" tab.
3. After that, mark the "Enable JavaScript" checkbox on "Web content" in the "Security" tab section.
4. Click "Reload the current page" button on the web browser, so that you can refresh the page.

So let us know how to enable JavaScript in different browsers: -

What is JavaScript Language?

JavaScript is not a programming language only if we are in a strict sense. Rather it is a scripting language because it instructs the browser to do all the dirty work of background. If you command to replace an image with another, the JavaScript browser tells it to do this. Because actually all the work is done by the browser, you just have to write some code in this scripting language so that the browser can do all your work. Especially, JavaScript is a very easy language for beginners.

Advantages and Disadvantages of JavaScript:

Like other computer languages, JavaScript also has some advantages and disadvantages. Where it was previously limited to only a few tasks, nowadays it is used in many tasks.

Advantages of JavaScript:

1. Client-side JavaScript is very fast because it runs instantly in the client-side browser. As long as outside resources are needed, JavaScript remains unhindered, from network calls in a backend server. There is no need to be compiled in the client side so that it gets some speed advantages.
2. JavaScript is very easy to learn and also to implement together.
3. JavaScript is used throughout the web. To learn it, too many resources on the Internet are indigenous. StackOverflow and GitHub are two big websites from which you can learn everything about JavaScript.
4. JavaScript is easily compatible with other languages, along with it is also used in many applications. Unlike PHP and SSI scripts, JavaScript can be easily inserted into any web page. JavaScript can also be used in other scripts that have been written in different languages such as Perl and PHP.
5. Due to this being used in the client-side, its demand decreases in the website server.
6. With drag, or drop components, or the slider, it provides a rich interface to your website.
7. Just now JavaScript has been used in many servers too. JavaScript is used in the front-end client’s server, as well as a complete whole JavaScript app can be made from front to back only with the help of JavaScript.

Disadvantages of JavaScript:

1. Because this code executes is the user's computer, so in some cases, it can also be exploited for malicious purposes. This is one of the main reasons for which some people prefer to disable JavaScript.
2. JavaScript is sometimes interpreted differently in different browsers. Wherever server-side scripts always produce the same type of output, the output of client-side scripts is somewhat unpredictable. Well, this is not a big problem as long as they are working properly in big and popular browsers, it is all safe.

JavaScript is the most commonly used client-side scripting language. JavaScript is written in HTML documents and it enables interactions in very unique ways with other web pages. For example, this can only be done because of JavaScript, automatically schedule appointments and play games online. In addition, new developments, such as Node.js, allow it to be used in server-side, similar APIs, such as HTML5, allows user media and other device features.

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