js关于命名空间的函数实例

var MYAPP = MYAPP || {};MYAPP.namespace = function(ns_string){    var parts = ns_string.split('.');    var parent = MYAPP;    var i=0;    if(parts[0]==="MYAPP"){      parts = parts.slice(1);    }    for(i=0 ; i<parts.length; i++){      if(typeof parent[parts[i]]=='undefined'){        parent[parts[i]]={};      }      parent = parent[parts[i]];    }    return parent;}var module2= MYAPP.namespace('MYAPP.modules.module2');