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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>/** * Module.js: module and namspace utilities * * This is a module of module-related utility functions that are * compatible with JSAN-type modules. * This module defines the namespace Module. */// Make sure we haven't already been loadedvar Module;if (Module && (typeof Module != "object" || Module.NAME)) throw new Error("Namespace 'Module' already exists");// Create our namespaceModule = {}; // This is some metainformation about this namespaceModule.NAME = "Module"; // The name of this namespaceModule.VERSION = 0.1; // The version of this namespace// This is the list of public symbols that we export from this namespace.// These are of interest to programers who use modulesModule.EXPORT = ["require", "importSymbols"];// These are other symbols we are willing to export. They are ones normally// used only by module authors and are not typically importedModule.EXPORT_OK = ["createNamespace", "isDefined", "registerInitializationFunction", "runInitializationFunctions", "modules", "globalNamespace"];// Now start adding symbols to the namespaceModule.globalNamespace = this; // So we can always refer to the global scopeModule.modules = { "Module": Module }; // Module name->namespace map./** * This function creates and returns a namespace object for the * specified name and does useful error checking to ensure that the * name does not conflict with any previously loaded module. It * throws an error if the namespace already exists or if any of the * property components of the namespace exist and are not objects. * * Sets a NAME property of the new namespace to its name. * If the version argument is specified, set the VERSION property * of the namespace. * * A mapping for the new namespace is added to the Module.modules object */Module.createNamespace = function(name, version) { // Check name for validity. It must exist, and must not begin or // end with a period or contain two periods in a row. if (!name) throw new Error("Module.createNamespace(): name required"); if (name.charAt(0) == '.' || name.charAt(name.length-1) == '.' || name.indexOf("..") != -1) throw new Error("Module.createNamespace(): illegal name: " + name); // Break the name at periods and create the object hierarchy we need var parts = name.split('.'); // For each namespace component, either create an object or ensure that // an object by that name already exists. var container = Module.globalNamespace; for(var i = 0; i < parts.length; i++) { var part = parts[i]; // If there is no property of container with this name, create // an empty object. if (!container[part]) container[part] = {}; else if (typeof container[part] != "object") { // If there is already a property, make sure it is an object var n = parts.slice(0,i).join('.'); throw new Error(n + " already exists and is not an object"); } container = container[part]; } // The last container traversed above is the namespace we need. var namespace = container; // It is an error to define a namespace twice. It is okay if our // namespace object already exists, but it must not already have a // NAME property defined. if (namespace.NAME) throw new Error("Module "+name+" is already defined"); // Initialize name and version fields of the namespace namespace.NAME = name; if (version) namespace.VERSION = version; ⌨️ 快捷键说明
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