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What Is JScript?

JScript is Microsoft's implementation of the ECMA-262 specification. ECMA (European Computer Manufacturers Association) is a European group that develops standards for technologies ranging from electronics to script languages. ECMAScript is the language standardized in the ECMA-262 specification, which was originally based on Netscape JavaScript1.1 and JScript 2.0. JavaScript 1.5 is also compliant with the ECMA-262 specification. JScript is a complete implementation of the ECMA-262 standard with a few additional features to support Microsoft Windows more fully, such as the capability to call COM objects.

Like VBScript, JScript is an interpreted language—you need only the source code in a .js file to execute a script in WSH. Like C++, JScript is object-oriented.