在JavaScript中创建类成员的最佳方法是什么

Question

What is the Best Way To Define Object Memeber and Please Explain Why

1 : 1st Way

var Obj = {
           M1 : 1,
           M2 : 2    
}

Using it like

 Obj.M1

2 :2nd Way

var Obj = function(){
 if (!(this instanceof Obj ))
            return new Obj ();
}
Obj.prototype.M1 =1 ;
Obj.prototype.M2 =2 ;

Using it Like

Obj().M1;

i mean with all that is using prototype better than defining the whole members with in these {} ?

Answer 1

That dependes whether you want to create multiple instances of Obj or just one. Aspects from class-based object oriented languages like inheritance are only possible when you use the second way (it's not real inheritance as you know it from class-based OO languages, but it's similar). Generally you can compare the first way with a static class in class-based OO programming languages in case you are more familiar with them.