STORE函数同时在主数组和辅数组(常规和反向映射)中创建一个项。

The STORE function creates an entry in both the primary and the secondary array (normal and reverse mapping).

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这些例程通常称为回调函数，因为在操作发生时会反向调用它们。

These routines are typically named callback functions, as they're called back to work upon some action.

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删除函数略微有些复杂，因为我们还想删除正在删除的键的反向映射。

Deletions are a little more complex, because we also want to delete the reverse mapping for the key we're deleting.

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