Object、Function、function Empty(){} 这三者有怎样的关系？
Object.__proto__ === Function.prototype === Function.__proto__ === function Empty(){};
Function.prototype.__proto__ === Function.__proto__.__proto__ === Object.__proto__.__proto__ === Object.prototype;
//当然这里的Empty我们是无法直接访问到的,且它没有prototype属性,即:
Empty.prototype === undefined
//这样就很容易看出：Function是对象，对象也是Function。
//另外：
Object.prototype.__proto__ === null;
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