javascript - Best way to define a function? -


I always learn how to define a function in JavaScript like this: 

  function my Function (Arg1, arg2) {...}

However, I was just reading, it mentions that I should define the methods like this: 

  Foo.prototype .bar = function () {...};

Question : Is the "Foo" example an object, or is it a namespace? Why Google Example is not the following code (which does not work): 

  prototype.bar = function () {...};

UPDATE : If it helps, then all my javascript will be called by the user browser for my web-application.

Your two examples are not functional equivalent The first example defines only functions (possibly a global one) , Unless you define it within any other function). The second example extends the prototype of a constructor, think about adding a method to class Foo .

Unless you are creating a Javascript library, my suggestion will not be to use or use any type of namespace system. Create a single global object that acts as a namespace through which you can use all your functions. 

  var MyObject = {utils: {someUtil: function () {}, second utility: function () {}}, animation: {// a function which animates something? Animate: function (element) {}}};

Then: 

  // Assume that the jQuery, but here's the library at $ ('. SomeClass'). Click (function () {MyObject.animation;) (this);}); If you want to emulate classes in javascript, you can define "class" as function (function is itself a constructor) and then  prototype  property. 
 
  function fu () {// This is constructor - initializing any property to this.a = 5; } // Add methods to the new defined "class" Foo.prototype = {doSomething: function () {/*...*/}, doSomethingElse: function () {/*...*/}};  
 
 then: 
 
  var bar = new Foo (); Console.log (bar.a); // 5 times. They have some (); // etc ...

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