Попробуйте следующее:
function conthunktor(Constructor) {
var args = Array.prototype.slice.call(arguments, 1);
return function() {
var Temp = function(){}, // temporary constructor
inst, ret; // other vars
// Give the Temp constructor the Constructor's prototype
Temp.prototype = Constructor.prototype;
// Create a new instance
inst = new Temp;
// Call the original Constructor with the temp
// instance as its context (i.e. its 'this' value)
ret = Constructor.apply(inst, args);
// If an object has been returned then return it otherwise
// return the original instance.
// (consistent with behaviour of the new operator)
return Object(ret) === ret ? ret : inst;
}
}