free vector pattern design

class way to create Singleton objects, in other languages often see such a notation, such as java,c#. But JavaScript is actually a non-class (Class-free) language, want an object, directly create it, there is no need to first create a class, and then create objects through the class, this is like wearing a warm-coat bathing. So a singleton based on "class" doesn't really work in JavaScript.In the actual project often use the state of the box, in gene

. Completionmethod (CalcState); This. Completionmethod (Numbertotest, Firstdivisor, IsPrime, E, Taskcanceled (asyncop.usersuppliedstate), ASYNCOP); Completionmethoddelegate (CalcState); }//This method computes the list of primes numbers used by the IsPrime method. Private ArrayList buildprimenumberlist (int numbertotest, asyncoperation asyncop) { ProgressChangedEventArgs e = null; ArrayList primes = new ArrayList

(@ " divisor cannot be 0"); } return self.numbera/self.numberb;} @endCalculation of the factory class OperationFactory.h#import#import "Add.h"#import "Sub.h"#import "Mul.h"#import "Div.h"#import "Operation.h"@interfaceOperationfactory:nsobject@property (nonatomic,strong) Add*add; @property (Nonatomic,strong) Sub*Sub; @property (nonatomic,strong) Mul*mul; @property (nonatomic,strong) Div*Div;-(Double) Createoperate: (Char) opreate;@endOperationfactory.m#import "OperationFactory.