for (property in objName)

function employee() {
  this.dept = "HR";
  this.manager = "John Johnson";
}
var ken = new employee();
function printProp() {
  for (property in ken) {
    alert(property);
  }
}

Try it. You will get two alert boxes: one for dept and one for manager.

People who read this tip also read these tips:

• Finding the Object's Value
• JavaScript's Object Types
• Advance Loading of External Scripts
• The .NET Framework's Common Language Runtime
• Changing a Button Faceplate