js模式（一）：单例模式

function Universe(){

         var instance;

         Universe = function (){

             return instance;

         }

         Universe.prototype = this;

         console.log(Universe);

         instance = new Universe();

         instance.constructor = Universe;

         instance.start_time = 0;

         instance.bng ="dd";

         return instance;

     }

     Universe.prototype.nothint = 1;

      console.log(Universe);

     var a = new Universe();

 console.log(Universe);

     var b = new Universe();

单例模式