writable._destroy(err, callback)

• err <Error> 可能的错误。
• callback <Function> 采用可选的错误参数的回调函数。

_destroy() 方法由 writable.destroy() 调用。 它可以被子类覆盖，但不能直接调用。

• err <Error> A possible error.
• callback <Function> A callback function that takes an optional error argument.

The _destroy() method is called by writable.destroy(). It can be overridden by child classes but it must not be called directly.