You don't have to treat a Product as an "addable" object, but that's its primary purpose.
您不必一定要把Product当作“可添加的”对象来对待，虽然这是它的主要目的。
It will expose our foo.bar function to scripts and ZClasses, and it will also have a little interface as an "addable" object, and that's about all.
它会把我们的foo . bar函数公开给脚本和ZClass，并且还有一个作为“可添加的”对象的小接口，这就是全部内容。
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