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What is JavaScript and how to enable?

What is JavaScript?

JavaScript is a commonly used client side scripting language. Or we can say it is used in all major web browsers.

It has the largest library ecosystem of any programming language. Since it is a scripting language, its code can also be written in an HTML page.

So when a user requests HTML page, in which a JavaScript is present, then this script is sent to the browser and it depends on the browser itself what it wants to do.

By the way, there is no relation of JavaScript with Java. Just because Java is used in its name, JavaScript is called: The World’s Most Misunderstood Programming Language (The world’s most misunderstood language)

JavaScript Official Name is ECMAScript defined under Standard ECMA-262.

What are JavaScript’s frameworks?

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

Introduction to JavaScript

JavaScript is one of the 3 languages ​​that all 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 the Behavior of Web Pages.

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.

Difference between java and javaScript 

Often people feel that the differences between Java and JavaScript are the same. But in reality there is nothing like that. So let’s know about the difference between these two.

JavaScript is not at all the same as Java. I want to tell you one more time that both JavaScript and Java are different.

By the way, the names of these two are definitely very swinging, which creates a doubt in the minds of the people. Where this language is primarily used as a scripting language in HTML pages, Java is a real programming language that is used entirely in other tasks.

Java can be a bit difficult to learn. It was developed by Sun Microsystem for use in all the things where computing power was needed.

JavaScript was developed by Brendan Eich, who used to work in Netscape at the time, he developed it on the basis of a client side scripting language (although there is no 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, Java had become very popular. Therefore, at the last possible moment, Netscape changed its name to “JavaScript”.

Both Java and JavaScript are native to C and C ++, but these languages ​​function very differently from their ancestors. Both languages ​​are object oriented yes and they also share some similar syntax. But there are more differences compared to similarities.

How to enable JavaScript?

Right now almost all web pages have JavaScript, it is a scripting programming language that runs in the visitor’s web browser.

This makes web pages functional for specific purposes, while if it is disabled for some reasons then, the content of web page or its functionality also becomes limited or unavailable.

So let’s know how to enable JavaScript in different browsers: –

In Google Chrome

1. In the menu of your web browser, click “Customize and control in Google Chrome” and select “Settings”.

2. In the “Settings” section, click on “Show advanced settings…”.

3. While under “Privacy”, click “Content settings.” In.

4. When the dialog window is open, you have to see the “JavaScript” section and select “Allow all sites to run JavaScript (recommended)”.

5. Then click “OK” button to close it.

6. Then Close “Settings” tab.

7. Click “Reload this page” button in your web browser so that 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 “Security” tab.

3. On the “Security” tab, click 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 this a “Warning!” The window pops out in which it will be asked “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 with the web browser so that the page will be refreshed again.

In Mozilla Firefox

1. In its address bar, type about: config and press Enter.

2. Click on ‘Becoming careful, I promise’ if any warning message appears in front of you.

3. While on the search box, search javascript.enabled

4. Then Toggle the “javascript.enabled” preference (right-click and select “Toggle” or double-click the preference) which you can change its value from “false” to “true”.

5. Click on the “Reload current page” button with the web browser, from which you can refresh the page.

In opera

1. Click Opera icon “Menu” and then “Settings”.

2. Click “Websites” and then choose “Allow all sites to run JavaScript (recommended)”

3. Click “Reload” button to refresh that page in web browser.

In Apple Safari

1. Click “Edit” in your web browser menu and select “Preferences”.

2. On the “Preferences” window, select “Security” tab.

3. Then mark the “Enable JavaScript” checkbox on the “Web content” of the “Security” tab section.

4. Click “Reload the current page” button in the web browser so that you can refresh the page.

What is JavaScript Language?

JavaScript is not a programming language only if we talk in the strict sense. Rather it is a scripting language because it instructs the browser to do all the miscelleneous tasks in the background.

If you command to replace an image with another, JavaScript tells the browser to do so. Because the browser actually does all the work, you only have to write some codes in this scripting language so that the browser can do all your work.

This is why JavaScript is a very easy language for beginners.

JavaScript Advantages and Disadvantages

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

 Benefits of javaScript

1. Speed. Client-side JavaScript is very fast because it runs immediately in the client-side browser. As long as outside resources are required, JavaScript remains completely unhindered from network calls to a backend server.

There is no need to compiled it on the client side, so that it gives some speed advantages.

2. Simplicity. JavaScript is very simple to learn as well as implement.

3. Popularity. JavaScript is used throughout the web. Along with this, there are many resources on the internet to learn it. StackOverflow and GitHub are two such big websites from where you can learn everything about Javascript.

4. Interoperability. JavaScript is easily compatible with other languages, with it being used in many applications. Unlike PHP and SSI scripts, JavaScript can be easily inserted into any web page.

JavaScript can also be used within other scripts that are written in different languages ​​such as Perl and PHP.

5. Server Load. Due to these being used on the client-side, its demand in the website server decreases.

6. Rich interfaces. Being drag, or drop components or slider, it gives your website a rich interface.

7. Versatility. Right now JavaScript is also being used in many servers. JavaScript is used in the front-end to the client server, as well as a complete entire JavaScript app can be created right now from front to back only with the help of JavaScript.

Loss of javascript

1. Client-Side Security. Since this code is executed from the users’ computer, so in some cases it can also be exploited for malicious purposes. This is the main reason for which some people like to disable Javascript more.

2.Browser Support. JavaScript is sometimes interpreted differently in different browsers. Where server-side scripts always produce the same type of output, the output of client-side scripts is slightly unpredictable.

By the way, this is not a big problem because as long as they are working properly in big and popular browsers, then everything is safe.

Today’s JavaScript

Talking about the present time, these scripts are popular in all places – it is the most commonly used client-side scripting language. JavaScript is written in HTML documents and it enables interactions with other web pages in very unique ways.

For example, it is only due to JavaScript that I can automatically schedule appointments and can play online games. In addition, new developments, such as Node.js, allow it to be used in server-side APIs, such as HTML5, allowing control of user media and other device features.

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