<html> <script> function Aggregation(name) { this.mAggregationName = name; } var oItemAgg = new Aggregation("item"); // so far, Aggregation oject has no available method debugger; Aggregation.prototype.generate = function(add, prototype) { var that = this, n = that.mAggregationName; add("getAggregation", prototype, function() { console.log(" getAggregation should be implemented here!"); }); } function add(name, proto, fn){ if ( !proto[name] ) { proto[name] = fn; } } oItemAgg.generate(add, Aggregation.prototype); oItemAgg.getAggregation(); debugger; </script>