Algorithm-javascript self-Implementation inheritance extend (single-Inheritance prototype object and single-inheritance constructor)

#  Self-implementing inheritance (one-time inheritance constructor)  //the constructor of the parent class   function father (name,age) {   this.name= name   this.age=age  }    //the prototype object of the parent class   father.prototype={    constructor:father,   say:function () {    console.log (' I  am  ' +this.name+ '  , ' +this.age+ '  years old ')    }  }     //class Inheritance: Inherits only the parent class template, does not inherit the prototype object (inherits from the method implementation of the constructor)     //the constructor of the subclass   function  child (Name,age) {   //call apply  Extended Parent template usage range     Child.superClass.constructor.call (this,name,age)   }  function extend (sub,sup) {    //initialization: Create empty function, empty template and empty prototype Object    var f=new function ()    // Empty function: Inherit only prototype object of parent class    f.prototype=sup.prototype   //subclass inherits empty function, can implement inherit only prototype object, do not inherit constructor     sub.prototype=new f ()    //also primitive constructors for atomic classes    sub.prototype.constructor=sub      // Save the parent prototype object, role 1: Decoupling, Function 2: Easy to get the parent class prototype object    sub.superclass=sup.prototype     }     extend (Child,father)   var c1=new child (' li4 ', +)   c1.say ()     console.log (Father.prototype.isPrototypeOf (C1))

Algorithm-javascript self-Implementation inheritance extend (single-Inheritance prototype object and single-inheritance constructor)