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What is the JScript and JavaScript.
 
Netscape introduced frames and LiveScript with Navigator 2. Since then, LiveScript has evolved considerably. As a result of its convergence of features with the Java programming language, it was renamed to "JavaScript." Internet Explorer (IE) also supports JavaScript, now, through Microsoft's implementation of "JScript." Since their introduction, both JavaScript and JScript have grown explosively and are used in many Web sites. One of its most popular features is the ability to open multiple windows for browsing the Web. JScript works in any version of Internet Explorer or Netscape Navigator on any platform it supports.

Perl , perl is a scripting language, it is the language used for the majority of CGI scripts. These are routines that run on Internet servers and respond to requests from browsers when a user completes a form. There are guestbook, message boards, voting pages, surveys, and more that use Perl scripts. Perl is a scripting language used in many CGI scripts on the Web, Just as interactive scripts run as CGI scripts .
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JScript is not Javascript, what is the difference between JScript and JavaScript.

JavaScript is a cross-platform, interpreted, object-oriented language originally designed for client-side web scripting. The elements of web pages can be manipulated via JavaScript as objects specified by the Document Object Model (DOM). This enables dynamic effects like image roll-overs and interactive effects like pages that change in response to user input without being reloaded from the server.
JScript is Microsoft's implementation of the language that contains similarities but also differences.
Netscape originally developed a scripting language for use in its browsers, calling it LiveScript. Java being an internet buzzword at that time, for marketing reasons they renamed the scripting language to JavaScript.
Microsoft implemented its own version of JavaScript and called it JScript.
The standard is only about the core language, with data and objects like numbers, strings, booleans, Object, Array, Function, Date, Math, but not about application specific objects like browser specific objects (document, window, links, images etc).
The core features of Netscape’s JavaScript and Microsoft’s JScript are pretty much compliant with the ECMA Script standard, but the application specific objects like the browser DOM (Document Object Model) and the server object model differ.
Most web browsers with the exception of Internet Explorer understand Javascript and so the original unmodified code worked properly in all of those browsers. Internet Explorer doesn't understand Javascript. Instead it treats any Javascript as if it were Microsoft's proprietary language JScript and processes it accordingly thus giving errors in IE when you use the same name for a variable as has been assigned within the web page source.
Java and JScript Work in the Same Environment
One is compiled, the other is interpreted. The development tools are different, and they have a surprisingly different audience. With JScript, your pages come alive! Your pages respond to the requests of your audience beyond a simple click here or there.

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Learning JScript is easy. By typing in just a few lines, you can be running a JScript application.
JScript is based on an action-oriented model of the World Wide Web. Java and JScript are alike in more than just name. However, there are significant differences between these two languages. As you learn to understand the differences, you will also understand how they can work together. Each has its place and neither does it all. Both JScript and Java are languages for building Internet applications. These applications require browsers. The browsers run these applications by reading code embedded in an HTML page. In other words, they both work in the same environment.
Microsoft has made it an open, cross-platform scripting language "JScript." . This is the primary reason why JScript is gaining wide acceptance. Several companies are expected either to incorporate JScript into their products or to provide an interface to JScript.
The most visible products will be the ActiveX controls and plug-ins. Work is also underway to provide other features, such as accessing high-end databases on the server. It will be interesting to see how this market develops.

All of this holds great potential for creating an exciting Web experience for your viewers. You will be able to use the same language to enhance your Web page, customize your server, create stunning effects with your controls and plug-ins, and communicate with specialized Java applets. JScript can make your Web page come alive; it can make your site an unforgettable experience that your users will want at the top of their favorites list.
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Variables, simple variables: var x = 8 ;
Variables and Variable Names, the statement x = 8 contains two components: the variable x and the value 8.

Data Types in JScript
There are five categories of data type, because it is possible to distinguish two different types of numbers (integers and floating-point numbers), and many different types of JScript objects, functions, and other structured types.:1- A JScript value may be such as: 0 , 9 :2- such as "Hello to World  " and 3- One of the logical values true or false .: 4- such as a function or object. :5- The special value null.

Logical Values. The logical, or Boolean, values true and false are typically used in expressions that test some condition to determine how to proceed. If that condition is met, one set of statements is executed; if it is not, another set is used instead. The first corresponds to the true condition, whereas the second represents the false condition. Not surprisingly, such expressions are known as conditional expressions. As you will see in the following section on "Operators," there are several comparison operators, such as the equality test (= =), which result in logical values. It is possible to think of true as 1 and false as 0. In fact, JScript often converts these logical values into 1 and 0, respectively
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Logical Operators. Logical operators in JScript are used either to carry out some form of test, or to combine the results of more than one such test. They are often referred to as conditional operators. The logical operators that perform a test of some sort are the equality/inequality operator (== and !=), the comparison operators (<, <=, >, and =>), and the logical negation operator (!). The operators that combine logical values are logical AND (&&) and logical OR (||). Finally, the conditional operator (?) and the comma operator (,) are also combining operators, although they are only vaguely logical operators.

Equality Operators. The binary equality (==) and inequality (!=) operators are used to test if two quantities are the same or different. These operators are overloaded. On integers, they test for strict equality or inequality. On floating-point numbers, they test to see whether the two quantities are equal within the precision of the underlying floating-point type. On strings, they test for exact equality-recall that case is significant in JScript strings. These operators all return a Boolean value, either true or false.
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Control Structures: (while,for, if)
The if Statement:

The if statement is used to conditionally execute a single block of code. It has two forms, the simple if statement and the if...else statement. The simple if statement consists of a conditional expression, known as the if test, and a block of code which is executed if that expression evaluates to a Boolean true.

Functions and Objects
Functions and objects represent the highest level of organization within the JScript language.
Introducing Object Orientation
About Objects. The concepts and terminology of object orientation to help students begin familiarizing themselves with what objects are and how they behave.
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Methods in JScript
Objects, Properties
Before we can delve into object-oriented programming in JScript, it is first necessary to review some of the basic concepts of object-oriented programming itself. You have already had a brief introduction in the "Functions and Objects"
Objects
What JScript calls an object is called a data structure (or class) in many other languages. As with JScript functions, there are two aspects to JScript objects: creating them and using them. A JScript object is made up of a set of component parts, which are called its properties, or members.The appointment object might have properties that specify the date and time of the appointment, as well as the name of the person with whom the appointment will take place. The pek object will have the  properties: day, month ,time,who ,why .Each of the properties of the pek object is referenced using the dot operator (.). Thus, pek.month refers to the month property and pek.why gives us the reason for the appointment.
JScript.net  can only be used on the server side of an ASP.NET.
JScript provides two ways to display data
The most common way to display information is the document.write( ), and document.writeln( ), which are methods of the document object, in alert, prompt, and confirm message boxes.

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1.              WScript.Echo (  " The First program "  );
WritingFirst Files  (jscrip-xhtml)    and   in: JScript.net  

  2.           var x = WScript.CreateObject('WScript.Shell');
WScript.Echo('Hello JScript ');
var x = x.Popup('Click yes', 15, 'x==6 yes and x ==1 No ', 3);
if (x==6)
WScript.Echo( 'Outputs ' + ' \n ' + ' 2 + 2 = ' , (2 + 2 ) );
if (x ==1)
WScript.quite;

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