Douglas Crockford的书中关于Function.prototype的“方法”

Question

In Crockford's book 'method' is added to Function.prototype

In my browser console, I did this

1. Function.method --> undefined
2. Function.prototype.method=function(name,func){this.prototype[name]=func; return this;} --> function(name,func){this.prototype[ame]=func; return this;}
3. (function(){}).method --> function(name,func){this.prototype[name]=func; return this;}
4. Function.method --> function(name,func){this.prototype[name]=func; return this;}

I can understand step 3, where a function literal has 'method' defined

But how come in step 4, Function.method, which was undefined in step 1, suddenly has 'method' defined.

Is Function an instance of itself ?

Answer 1

Is Function an instance of itself ?

Yes .

Function instanceof Function;
> true