How to add new property to object created with constructor?

1

example:

function Person(first,last,age){
   this.first=first;
   this.last=last;
   this.age=age;
} //constructor

var john = new Person(John,Smith,55);

Now my question is, how do i add eyecolor property for john only?

2

you can do this by using following code;

function Person(first,last,age){
   this.first=first;
   this.last=last;
   this.age=age;
} //constructor

var john = new Person('John','Smith',55);
john.eyecolor="blue";
console.log(john);
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