How To Call Parent Function in Child Class 

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SubClass.prototype.foobar = function(str) {
	BaseClass.prototype.foobar.call(this, str);
	console.log("bbb");
};

yea, as simple as that.

Don’t forget sub-class is made of this

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SubClass.prototype = new BaseClass();

This makes all legit.

Full source view

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function BaseClass(){}
BaseClass.prototype.foobar = function(str) {
	console.log(str);
};

function SubClass(){}
SubClass.prototype = new BaseClass();
SubClass.prototype.constructor = SubClass;
SubClass.prototype.foobar = function(str) {
	BaseClass.prototype.foobar.call(this, str);
	console.log("bbb");
};