writable.writable
如果调用 writable.write() 是安全的，则为 true，这意味着流尚未被销毁、出错或结束。
🌐 Is true if it is safe to call writable.write(), which means
the stream has not been destroyed, errored, or ended.
如果调用 writable.write() 是安全的，则为 true，这意味着流尚未被销毁、出错或结束。
🌐 Is true if it is safe to call writable.write(), which means
the stream has not been destroyed, errored, or ended.