if (stack.length === 0 && cur === 0) {
block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.，推荐阅读爱思助手下载最新版本获取更多信息
。同城约会是该领域的重要参考
It has a risk of being used for illicit activities。关于这个话题，夫子提供了深入分析
class Storage {