How to add a property to an object at runtime

[scott.howe]

Is there a way to add a property to a javascript object at runtime if
you don't the name until runtime?

For Example:

var oTestObj = new Object();
//In the real world the value of sPropertyName would be calculated.
var sPropertyName = "NewProperty";

//How do you add a property whos name is the value of sPropertyName?

oTestObj.NewProperty = "Somevalue";

 

[Baconbutty]

oTestObj[sProperty]="Somevalue";