Javascriptnewfun Execution Process _ js object-oriented

Newfun's execution process analysis. For more information about object-oriented learning, see. (1) create a new object and point this pointer to it;
(2) assign all the members of the prototype object of the function to this new object;
(3) execute the function body to initialize the object;
(4) return the object created in (1.

The Code is as follows:

Function BB (){
This. aa ();
Alert ("s ");

}
// Alert (typeof BB. prototype. constructor );
BB. prototype. aa = function () {alert ("sss ");}
Var nn = new BB ("cc ");
// Var nn = {}; BB. apply (nn)
// Nn = BB. prototype;

Alert (nn. constructor );