将类数组对象转换为数组对象。

Turns an array-like object into a true array.

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查询的结果在一个DocumentReference类数组中返回。

The results of the query are returned in an array of the DocumentReference class.

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函数可以存储于关联数组中(关联数组是这样一类数组：它们按名称而不是数值索引)。

Functions can be stored in associative arrays (arrays that are indexed by names rather than Numbers).

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