/* Basic Singleton. */ var Singleton = { attribute1: true, attribute2: 10, method1: function() { }, method2: function(arg) { } }; 单件模式最主要的用途之一就是命名空间： /* GiantCorp namespace. */ var GiantCorp = {}; GiantCorp.Common = { // A singleton with common methods used by all objects and modules. }; GiantCorp.ErrorCodes = { // An object literal used to store data. }; GiantCorp.PageHandler = { // A singleton with page specific methods and attributes. }; 利用闭包在单件模式中实现私有方法和私有变量： GiantCorp.DataParser = (function() { // Private attributes. var whitespaceRegex = /\s+/; // Private methods. function stripWhitespace(str) { return str.replace(whitespaceRegex, ''); } function stringSplit(str, delimiter) { return str.split(delimiter); } // Everything returned in the object literal is public, but can access the // members in the closure created above. return { // Public method. stringToArray: function(str, delimiter, stripWS) { if(stripWS) { str = stripWhitespace(str); } var outputArray = stringSplit(str, delimiter); return outputArray; } }; })(); // Invoke the function and assign the returned object literal to // GiantCorp.DataParser. 实现Lazy Instantiation 单件模式： MyNamespace.Singleton = (function() { var uniqueInstance; // Private attribute that holds the single instance. function constructor() { // All of the normal singleton code goes here. ... } return { getInstance: function() { if(!uniqueInstance) { // Instantiate only if the instance doesn't exist. uniqueInstance = constructor(); } return uniqueInstance; } } })(); MyNamespace.Singleton.getInstance().publicMethod1();