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while (stack.length 0 && nums[stack[stack.length - 1]] <= curHeight) {
与摄影器材、舞台灯光类似，它属于活动经济的一部分，而活动经济本身具有明显的淡旺季波动。只要旺季结束，设备闲置率就会上升。。爱思助手下载最新版本对此有专业解读
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"Or consider pipeTo(). Each chunk passes through a full Promise chain: read, write, check backpressure, repeat. An {value, done} result object is allocated per read. Error propagation creates additional Promise branches.
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