下面給出一個完成的函數，仔細的體會一下。
function getConditions(strCity : String) : String
{
   var now : Date = new Date();
   switch (strCity.toUpperCase())
   {
   case "LONDON":
      if (now.getMonth() <= 7 now.getMonth() >= 9)
      {
         return "overcast";
      }
      else
      {
         return "partly overcast and humid";
      }
      break;
   case "SEATTLE":
      if (now.getMonth() == 7 && now.getDay() == 4)
      {
         return "torrential rain";
      }
      else
      {
         return "rain";
      }
      break;
   case "LA":
      return "smoggy";
      break;
   case "PHOENIX":
      return "damn hot";
      break;
  default:
      return "partly cloudy with a chance of showers";
   }
}
    使用Jscript.net,你也可以定義其他.net架構的類型，通過引用命名空間和派生類可以向Jscript.net引入新的數據類型。這樣在兩者的數據類型中就有可能產生重疊。參見下表：
Boolean    .NET Framework Boolean / JScript boolean
Number    .NET Framework Double / JScript number
String    .NET Framework String / JScript string
Int    .NET Framework Int32
Long    .NET Framework Int64
Float    .NET Framework Single
Double    .NET Framework Double
Object    .NET Framework Object / JScript Object
Date    JScript Date object
Array    JScript Array
Function    JScript Function object