JavaScript Design Patterns and open practice Learning (iv) Private variables

In order to avoid contamination of global variables, it can be privatized with the addition of namespaces and closure packages.

One, using namespaces

Change a variable to a private variable under a namespace

varmyapp={}; Myapp.namespace=function(name) {varParts=name.split ('. ')); varCurrent=MyApp;  for(varIinchparts) {            if(!Current[parts[i]]) {Current[parts[i]]={}; } Current=Current[parts[i]];    }    }; Myapp.namespace (' Event '); Myapp.namespace (' Dom.style '); Console.dir (MYAPP);

The above is equivalent to

var myapp={        event:{},        dom:{            style:{}}        ;

This defines the two properties event and Dom under the MyApp namespace.

Second, the use of closures

var user= (function  () {        var _name= ' ls ',        _age=27;         return {            getuserinfo:function  () {                return _name+ ' _ ' +_age;            }        }    }) ();    Console.log (User.getuserinfo ());

The name and age attributes are encapsulated and cannot be accessed externally.

JavaScript Design Patterns and open practice Learning (iv) Private variables