What is JavaScript? - Definition

In this article you learn the basics of JavaScript and create your first JavaScript program.

What is JavaScript? - Definition

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What is JavaScript? - Definition

     

In this article you learn the basics of JavaScript and create your first JavaScript program.

What is JavaScript?
JavaScript is scripting language used for client side scripting. JavaScript developed by Netscape in 1995 as a method for validating forms and providing interactive content to web site. Microsoft and Netscape introduced JavaScript support in their browsers.

Benefits of JavaScript
Following are the benefits of JavaScript.

  • associative arrays
  • loosely typed variables
  • regular expressions
  • objects and classes
  • highly evolved date, math, and string libraries
  • W3C DOM support in the JavaScript

Disadvantages of JavaScript

  • Developer depends on the browser support for the JavaScript
  • There is no way to hide the JavaScript code in case of commercial application

Creating your first JavaScript Program

In the first lesson we will create very simple JavaScript program and run in the Internet Explorer. This example simply displays "Welcome to JavaScript World!" message in the browser.

Test JavaScript program from here.

Here is the code of JavaScript program:

<html>
<head>
<title>First Java Script</title>
<script language="JavaScript">
function sayhello(){
alert("Welcome to JavaScript World!");
}
</script>
</head>
<body>

<p><b>Click the following link to run your first java script example</b></p>
<p><a href="javascript:sayhello()">Run JavaScript First Program</a></p>

</body>

 

     

Tutorials

  1. JavaScript method doScroll()
  2. Popup Window Example in JavaScript
  3. JavaScript method deleteRow()
  4. JavaScript Variables and Data types
  5. Java Script Code of Calendar and Date Picker or Popup Calendar
  6. JavaScript - JavaScript Tutorial
  7. Looping In Java Script
  8. What is JavaScript? - Definition
  9. Conditional Examples(if - else- switch case) in JavaScript
  10. Classes-Objects in JavaScript
  11. String Number Operations in JavaScript
  12. Conditions In Java Script
  13. JavaScript - JavaScript Tutorial
  14. JavaScript Object Oriented Feature
  15. Form Validation using Regular Expressions is JavaScript
  16. Navigation with Combo box and Java Script
  17. Simple Calculator Application In Java Script
  18. JavaScript Combo Box Validation
  19. JavaScript createPopup method
  20. JavaScript appendChild method
  21. JavaScript add method
  22. JavaScript addImport example
  23. JavaScript appendData method
  24. JavaScript applyElement method Example
  25. JavaScript blink method
  26. JavaScript bold method
  27. JavaScript clear method
  28. JavaScript clearTimeOut method
  29. JavaScript click method
  30. JavaScript cloneNode example
  31. JavaScript createAttribute method
  32. JavaScript createCaption method
  33. JavaScript createComment method
  34. JavaScript createEventObject method
  35. JavaScript createTFoot method
  36. JavaScript createTHead method
  37. JavaScript deleteCaption method
  38. JavaScript deleteTFoot method
  39. JavaScript deleteTHead method
  40. JavaScript dragDrop method