JS implements resend_javascript technique of self

ECMA V5 defines a long-awaited method: Object.getPrototypeOf, which can get the prototype of an object ([[prototype]]) regardless of type information. Based on this, we can construct a resend: (Please use Chrome 5, IE9 preview third version test)

Copy code The code is as follows:

obj.resend = function () {
var pof = Object.getPrototypeOf;
var has = function() {......} // hasOwnProperty encapsulation
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;
}
}()