参考答案

参考回答：

Function.prototype.bind2 = function (context) {
if (typeof this !== "function") {
throw new Error("Function.prototype.bind - what is trying to be bound is not callable");
}
var self = this;
var args = Array.prototype.slice.call(arguments, 1);
var fNOP = function () {};
var fbound = function () {
self.apply(this instanceof self ? this : context, args.concat(Array.prototype.slice.call(arguments)));
}
fNOP.prototype = this.prototype;
fbound.prototype = new fNOP();
return fbound;
}