Changing the Value of a Property
Some properties are "read-only," which means your code can only read the current value and can't change it. However, many properties are "read/write," which means you can also change their values. To change the value of a property, use the following generic syntax:
object.property = value
As before, object is the name of the object that has the property, and property is the name of the property you want to change. The value part is a literal value (such as a string or number) or an expression that returns the value to which you want to set the property.
Example : Changing the value of a property