闭包中的实例

function Universe() {
        //缓存实例
        var instance = this;
        
        // 重写构造函数
        Universe = function(){
            return instance;
        };

        this.start_time = 0;
        this.bang = "Big";

        //保留原型属性
        Universe.prototype = this;    //var a = {}, b = {};  a = b; a.no = "no";  b.no;// "no"
                                    //对象的引用，这里若定义Universe.prototype 就是 定义 this 的属性   证据A

        //实例
        instance = new Universe();

        //重置构造函数指针
        instance.constructor = Universe;

        //所有功能
        instance.start_time = 0;
        instance.bang = "Big";

        return instance;
    }

    Universe.prototype.nothing == true;
    
    var uni = new Universe();

    Universe.prototype.everything = true;
    var uni2 = new Universe();
    

    console.log(uni === uni2);                            //true

    console.log(uni.constructor === Universe);            //true

    console.log(Universe.prototype);                    //其实就是 Universe 对象   证据A

    console.log(uni.everything);                        //true        证据A