ECMA V5定義了一個期待已久的方法：Object.getPrototypeOf，它可以無視型別信息得到某對象的原型（[[prototype]]），基於此，我們可以構造出一個resend：（請用Chrome 5、IE9預覽第三版測試）
復制代碼 代碼如下:
obj.resend = function() {
var pof = Object.getPrototypeOf;
var has = function() {......} // hasOwnProperty的封裝
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;
}
}()