您还需要统计数组中的元素个数，并将其保存在变量 $numstories 中。

You also need to count the number of elements in the array and use a variable $numstories to contain the result.

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count 函数统计数组中的元素个数，所以在本例中 $elems 应该等于3。

The count function counts the number of elements in an array, so you would expect $elems to equal 3 in the example.

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这些 XHR 对象保存在一个数组内，数组为每个表单分配一个数组元素。

The XHR objects are kept in an array that allocates one element for each form.

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