This is probably the biggest leap in functionality for JScript since the 1996 introduction of JScript version 1.0 with Internet Explorer 3.0. JScript has traditionally been used to develop client-side scripts due to its ubiquitous, cross-platform support on the Internet, but we’ve been seeing a steady increase in the usage of JScript on the server?particularly in Active Server Pages (ASP). For example, your favorite Web site (MSDN) uses a large amount of server-side JScript, as do many other sites on the Internet.
Un ottimo tutorial sul nuovo Javascript, capace di cose interessanti, come in questo esempio

// Wrap the function inside a class statement.
class Car
{
  // Declare the class members. I've used types in this example,
  // but they are not required. I could have also marked the class
  // as being 'expando' and not had to declare these members.
  var make : String;
  var color : String;
  var year : int;

  // Old constructor function, unchanged.
  function Car(make, color, year)
  {
     this.make = make;
     this.color = color;
     this.year = year;
  }

  // Move the function inside the class
  function GetDescription()
  {
     return this.year + " " + this.color + " " + this.make;
  }
}

// Create and use a new Car object
var myCar = new Car("Accord", "Maroon", 1984);
print(myCar.GetDescription());

Aggiungiamo che il compilatore JScript (jsc.exe) è in tutte le macchine su cui è installato il Framework .NET e il discorso si fa molto interessante.