Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
政者，正也。政绩观树得正，办事情才能过得硬。
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2.6 ELU（Exponential Linear Unit），更多细节参见搜狗输入法下载
for (let i = n - 1; i = 0; i--) {