用于对数组进行排序的函数是 compareFunction，该函数是作为参数传递给 sort 函数的。

The function used to sort the array is the compareFunction that was passed into the function when it was called.

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比如，compare方法比较两个字符串；sort和asort方法以与相应的php数组函数相同的方式对数组或关联数组进行排序。

For example, the compare method compares two strings; the sort and asort methods sort arrays or associative arrays in a way similar to the corresponding PHP array functions.

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