ECMA V5定义了一个期待已久的方法：Object.getPrototypeOf，它可以无视型别信息得到某对象的原型（[[prototype]]），基于此，我们可以构造出一个resend：（请用Chrome 5、IE9预览第三版测试）

复制代码 代码如下:

obj.resend = function() {

var pof = Object.getPrototypeOf;

var has = function() {......} // hasOwnProperty的封装

var make = function(obj, old) {

return function(name, args) {

var step = pof(obj),

r;

while (step && !has(step, name)) step = pof(step);

if (!step) throw new Error('Unable to resend: method missing');

var foundMethod = step[name];

var backup = arguments.callee;

this.resend = make(this, backup);

r = foundMethod.apply(this, Array.prototype.slice.call(arguments, 1));

this.resend = old;

return r

}

};

return function(name, args__) {

var rv;

var old = this.resend;

this.resend = make(this, old);

rv = this.resend.apply(this, arguments);

this.resend = original;

return rv;

}

}()