1   var SingletonTester = (function () {  2         //单例方法  3         function Singleton(args) {  4             var args = args || {};  5             this.name = ‘SingletonTester‘; //方法对外的属性，另外一种方式就是返回对象  6             this.pointX = args.pointX || 6;  7             this.pointY = args.pointY || 10;  8         }  9 10         //单例实例 11         var instance; 12 13         //返回对象 14         return { 15             name: ‘SingletonTester‘, 16 17             getInstance: function (args) { 18                 if (instance === undefined) { 19                     instance = new Singleton(args); 20                 } 21                 return instance; 22             } 23         }; 24     })(); //直接执行该方法 25 26     //测试 27     var test = SingletonTester.getInstance({ pointX: 5 }); 28     console.log(test.pointX);29  30 31  32 33  

 1  function Universe() {  2       // 判断是否存在实例  3       if (typeof Universe.instance === ‘object‘) {  4           return Universe.instance;  5       }  6  7       // 其它内容  8       this.start_time = 0;  9       this.bang = "Big"; 10 11       // 缓存 12       Universe.instance = this; 13 14       // 隐式返回this 15   } 16 17   // 测试 18   var uni = new Universe(); 19   var uni2 = new Universe(); 20   console.log(uni === uni2); // true21