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The reason for this problem is probably the total parameter except the problem, the value is NaN, you can check if this is the problem.

 为什么这段代码执行的结果是 正常执行 nextTick延迟执行1 nextTick延迟执行2 setImmediate延迟执行1 setImmediate延迟执行2 强势插入 按照上面你的观点，应该是下面的结果： 正常执行 nextTick延迟执行1 nextTick延迟执行2 setImmediate延迟执行1 强势插入 setImmediate延迟执行2 请解惑一下，深入浅出Node.js里面给出的结果也是 正常执行 nextTick延迟执行1 nextTick延迟执行2 setImmediate延迟执行1 强势插入 setImmediate延迟执行2

I also have the same problem in the 6.x version.I found the problem is in this.close() method in ui/baseUI.js.More specific is the combination of ```js this.rl.pause() this.rl.close(). ``` I also...