Simple inheritance relationship in JavaScript---cocos2d JS

The JavaScript language itself does not provide a class, there is no other language class inheritance mechanism, its inheritance through the object's prototype implementation, but this does not meet our requirements for the COCOS2D-JS engine, all classes are directly or indirectly inherited implementation.

var person = class.extend ({ //Declaring a person class, inheriting from Class,class.extend () means inheriting from class

Init:function (isdancing) { //define constructor init initialization properties

this.dancing = isdancing;

},

Dance:function () { //define normal function dance (), return property dancing

return this.dancing;

}

});

var Ninja = person.extend ({ //Declaration Ninja class inherits from Person class

Init:function () { ///defines the constructor init, in which the This._super (false) statement is called when the parent class constructor initializes the property in the parent class

This._super (false);

},

Dance:function () { ///Overrides the Dance () function, which overrides the dance () function of the parent class

//call the inherited version of Dance ()

return This._super (); //Call the Dance () function of the parent class

},

Swingsword:function () { //This function is a subclass Ninja newly added function Swingsword ()

return true;

}

});

var p = new Person (true); //Create a P object from the person class, the argument to the constructor is true

Console.log (P.dance ()); //Print P Object Dance Property --True

var n = new Ninja (); //Create n objects through the Ninja class, construct function bits empty, default initialization takes the dance attribute in Fales initialization parent class, prints to False

Console.log (N.dance ()); //false

Console.log (N.swingsword ()); //true

This simple JavaScript inheritance method actually implements the object-oriented concept inheritance and polymorphism mechanism in general sense, which is the core of COCOS2D-JS inheritance mechanism.

Simple inheritance relationship in JavaScript---cocos2d JS