JavaScript simulates namespace_javascript tips

In C and C#, namespaces are used to minimize name conflicts. For example, in the .NET Framework, namespaces help distinguish the Microsoft.Build.Task.Message class from System.Messaging.Message. JavaScript doesn't have any language-specific features to support namespaces, but it's easy to emulate namespaces using objects. If you are creating a JavaScript library, you can wrap them inside a namespace without defining global functions and classes, like this:

var MSDNMagNS = {};
MSDNMagNS.Pet = function(name) { // code here };
MSDNMagNS.Pet.prototype.toString = function() { // code };
var pet = new MSDNMagNS.Pet(“Yammer”);

A level of a namespace may not be unique, so nested namespaces can be created:

var MSDNMagNS = {};
// nested namespace “Examples”
MSDNMagNS.Examples = {};
MSDNMagNS.Examples.Pet = function(name) { // code };
MSDNMagNS.Examples.Pet.prototype.toString = function() { // code };
var pet = new MSDNMagNS.Examples.Pet(“Yammer”);

As you can imagine, typing these lengthy nested namespaces can be tiring. Fortunately, library users can easily specify shorter aliases for namespaces:

// MSDNMagNS.Examples and Pet definition...
// think “using Eg = MSDNMagNS.Examples;”
var Eg = MSDNMagNS.Examples;
var pet = new Eg.Pet(“Yammer”);
alert(pet);

If you look at the source code of the Microsoft AJAX library, you will find that the author of the library used similar technology to implement namespaces. I will not explain it in detail here. Friends who need it can go to Du Niang to find it.

The above is the entire content of this article, I hope it will be helpful to everyone learning javascript