What is the difference between Parasitic Combination Inheritance and Combination Inheritance in javascript?

The example codes of these two types of inheritance are here:

Parasitic Co开发者_如何学Gombination Inheritance: http://jsfiddle.net/dKKaS/

Combination Inheritance: http://jsfiddle.net/XZn3A/

Could someone tell me the difference? Thanks.

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The answer is that with Parasitic Combination Inheritance, the base constructor is only called once. With Combination Inheritance, the constructor gets called two times.