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INTRODUCTION TO JAVASCRIPT
CONCEPT-
JavaScript is an object-oriented language that allows the creation of interactive web pages. It allows user entries, which are located into an HTML form to be processed as required. JavaScript has various advantages for a web designer. Its strength can be used to extend the functionality of HTML pages, already loaded on a web site.
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JAVASCRIPT: MERITS
1. Embedded With HTML: JavaScript does not require any separate editor for web programming. It can use any text editor like Notepad. HTML files are embedded with JavaScript commands, which can be interpreted by any browser.
2. Easy To Learn: Web applications can be easily designed by using certain commands with simple syntax.
3. Performance: JavaScript can be written such that the HTML files are fairly compact and quite small. This minimizes storage requirements on the web server and downloads time for the client. Additionally, because JavaScript programs are usually included in the same file as the HTML code for a web page, they require fewer separate network accesses.
4. Procedural Capabilities: Every programming language needs to support facilities such as condition checking, looping and branching. JavaScript provides syntax, which can be used to add such procedure capabilities to web page coding.
5. Easy Debugging And Testing: Being an interpreted language, JavaScript's are tested line by line and the errors are also listed as they are encountered, i.e. an appropriate error message along with the line number is listed for every error that is encountered.
6. Platform Independence: JavaScript is a programming language that is completely independent of the hardware on which it works. It is a language that is understood by any JavaScript enabled browser. Thus JavaScript applications work on any machine that has appropriate JavaScript enabled browser installed. This machine can be anywhere on the network.
JAVASCRIPT IN HTML
JavaScript is embedded into an HTML file. A browser reads an HTML files and interprets HTML tags. Since all JavaScript's need to be included as an integral part of an HTML document when required, the browser needs to be informed that specific sections of HTML code is JavaScript. The browser will then use its built-in JavaScript engine to interpret this code.
The tags are used for including the JavaScript statements with HTML documents.
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ARRAYS IN JAVASCRIPT
An array is a special subscript variable which stores number of values of same type. It's element index starts with 0. An array must be declared before it is used. The new operator is a special operator that is used to create an instance of an object type. Similarly, the delete operator is used to delete a property of an object or an element at an array index.
SOME FAQS:
1. What is JavaScript?
2. What are the advantages of using JavaScript?
3. What is Array? Explain with example.
4. Define Switch. Case statement with one example.
5. Define WHILE loop with one any example.
6. Define If conditional statement with example.
7. Define the use of functions with one example.
About the Author
Web Tradez, India's leading web-design and web-development company in Delhi. Web design and web development is our passion. We believe we can make your life easy and help you generate more business from your website.
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Submitted on: 2016-08-12 00:21:48