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JavaScript Properties
Properties are the values associated with a JavaScript object.
A JavaScript object is a collection of unordered properties.
Properties can usually be changed, added, and deleted, but some are read only.
Accessing JavaScript Properties
The syntax for accessing the property of an object is:
objectName.property // person.age
or
objectName["property"] // person["age"]
or
objectName[expression] // x = "age"; person[x]
The expression must evaluate to a property name.
Example 1
person.firstname + " is " + person.age + " years old.";
Example 2
person["firstname"] + " is " + person["age"] + " years old.";