Module.createNamespace('Hongru');
Module.createNamespace('me', 0.1);
me.EXPORT = ['define']
me.define = function () {
this.NAME = '__me';
}
Module.importSymbols(me, Hongru);//把me名字空间下的标记导入到Hongru名字空间下
可以看到测试结果：
本来定义在me名字空间下的方法define（）就被导入到Hongru名字空间下了。当然，这里说的导入导出，其实只是copy，在me名字空间下依然能访问和使用define（）方法。
好了，大概就说到这儿吧，这个demo也只是提供一种管理名字空间的思路，肯定有更加完善的方法，可以参考下YUI，EXT等框架。或者参考《JavaScript权威指南》中模块和名字空间那节。
最后贴下源码：
复制代码 代码如下:
/* == Module and NameSpace tool-func ==
* author : hongru.chen
* date : 2010-12-05
*/
var Module;
//check Module --> make sure 'Module' is not existed
if (!!Module && (typeof Module != 'object' || Module.NAME)) throw new Error("NameSpace 'Module' already Exists!");
Module = {};
Module.NAME = 'Module';
Module.VERSION = 0.1;
Module.EXPORT = ['require',
'importSymbols'];
Module.EXPORT_OK = ['createNamespace',
'isDefined',
'modules',
'globalNamespace'];
Module.globalNamespace = this;
Module.modules = {'Module': Module};
// create namespace --> return a top namespace
Module.createNamespace = function (name, version) {
if (!name) throw new Error('name required');
if (name.charAt(0) == '.' || name.charAt(name.length-1) == '.' || name.indexOf('..') != -1) throw new Error('illegal name');
var parts = name.split('.');
var container = Module.globalNamespace;
for (var i=0; i<parts.length; i++) {
var part = parts[i];
if (!container[part]) container[part] = {};
container = container[part];
}
var namespace = container;
if (namespace.NAME) throw new Error('module "'+name+'" is already defined');
namespace.NAME = name;
if (version) namespace.VERSION = version;
Module.modules[name] = namespace;
return namespace;
};
// check name is defined or not
Module.isDefined = function (name) {
return name in Module.modules;
};
// check version
Module.require = function (name, version) {
if (!(name in Module.modules)) throw new Error('Module '+name+' is not defined');
if (!version) return;
var n = Module.modules[name];
if (!n.VERSION || n.VERSION < version) throw new Error('version '+version+' or greater is required');
};
// import module
Module.importSymbols = function (from) {
if (typeof form == 'string') from = Module.modules[from];
var to = Module.globalNamespace; //dafault
var symbols = [];
var firstsymbol = 1;
if (arguments.length>1 && typeof arguments[1] == 'object' && arguments[1] != null) {
to = arguments[1];
firstsymbol = 2;
}
for (var a=firstsymbol; a<arguments.length; a++) {
symbols.push(arguments[a]);
}
if (symbols.length == 0) {
//default export list
if (from.EXPORT) {
for (var i=0; i<from.EXPORT.length; i++) {
var s = from.EXPORT[i];
to[s] = from[s];
}
return;
} else if (!from.EXPORT_OK) {
// EXPORT array && EXPORT_OK array both undefined
for (var s in from) {
to[s] = from[s];
return;
}
}
}
if (symbols.length > 0) {
var allowed;
if (from.EXPORT || form.EXPORT_OK) {
allowed = {};
if (from.EXPORT) {
for (var i=0; i<form.EXPORT.length; i++) {
allowed[from.EXPORT[i]] = true;
}
}
if (from.EXPORT_OK) {
for (var i=0; i<form.EXPORT_OK.length; i++) {
allowed[form.EXPORT_OK[i]] = true;
}
}
}
}
//import the symbols
for (var i=0; i<symbols.length; i++) {
var s = symbols[i];
if (!(s in from)) throw new Error('symbol '+s+' is not defined');
if (!!allowed && !(s in allowed)) throw new Error(s+' is not public, cannot be imported');
to[s] = form[s];
}
}
您可能感兴趣的文章: