单例
在JavaScript里,单例作为一个命名空间提供者,从全局命名空间里提供一个唯一的访问点来访问该对象。
var mySingleton = { property1: "something", property2: "something else", method1: function () { console.log('hello world'); } };
var mySingleton = function () { /* 这里声明私有变量和方法 */ var privateVariable = 'something private'; function showPrivate() { console.log(privateVariable); } /* 公有变量和方法(可以访问私有变量和方法) */ return { publicMethod: function () { showPrivate(); }, publicVar: 'the public can see this!' }; }; var single = mySingleton(); single.publicMethod(); // 输出 'something private' console.log(single.publicVar); // 输出 'the public can see this!'
var Singleton = (function () { var instantiated; function init() { /*这里定义单例代码*/ return { publicMethod: function () { console.log('hello world'); }, publicProperty: 'test' }; } return { getInstance: function () { if (!instantiated) { instantiated = init(); } return instantiated; } }; })(); /*调用公有的方法来获取实例:*/ Singleton.getInstance().publicMethod();