آموزش جاوا اسکریپت Java Script قسمت دهم

 var person = new Object();
person.firstName = “Ali”;
person.lastName = “Karimi”;
person.sayHello = function() { console.log(“Hello “ + this.firstName);};
}

 function Person(name, family){
 this.firstName = name;
 this.lastName = family;
 this.sayHello = function() { console.log(“Hello “ + this.firstName)};
}
var person1 = new Person(“Ali”, “Karimi”);
var person2 = new Person(“Ali”, “Alavi”);

 Person.prototype.toString = function(){
 return this.firstName + “ “ + this.lastName;
}
var person = new Person(“Ali”, “Karimi”); // ایجاد شئ ای با نام علی و نام خانوادگی کریمی
document.write(person.toString()); // return “Ali Karimi”

 function Rectangle(x,y){
 this.x = x;
 this.y = y;
}
// Define a function in prototype.
// Child objects will inherit it.
Rectangle.prototype.area = function(){
 return this.x * this.y;
}
function Square(x){
 Rectangle.call(this,x,x);// Call parent constructor with context switch.
}
Square.prototype = new Rectangle(); // Chain Square prototype to Rectangle

Square.prototype.constructor = Square; // Define constructor for this prototype

Square.prototype.perimeter = function(){
 return this.x * 4;
}
var mySquare = new Square(3);
mySquare.area(); // Returns 9

(mySquare instanceof Square); // returns true
(mySquare instanceof Rectangle); // returns true