在Clojure（core.async）中alts和alt之间有什么区别？

alts！一个函数，接受要从中取出的频道向量和/或带有值的频道（以双向向量的形式： [cv] ）。可以动态地构造向量;调用 alts！的代码可能不知道它将选择多少个频道（并且实际上该调用不需要在调用中保持不变）。

alts! is a function that accepts a vector of channels to take from and/or channels with values to be put on them (in the form of doubleton vectors: [c v]). The vector may be dynamically constructed; the code calling alts! may not know how many channels it'll be choosing among (and indeed that number need not be constant across invocations).

alt！是一个方便的宏，基本上作为 cond 和 alts！。这里，端口（通道或通道+值对）的数量必须静态地知道，但是在实践中这是经常的情况，并且 cond 清除

alt! is a convenience macro which basically acts as a cross between cond and alts!. Here the number of "ports" (channels or channel+value pairs) must be known statically, but in practice this is quite often the case and the cond-like syntax is very clear.

alt！使用 alts！ c $ c>;除了语法方便之外，它不提供额外的功能。

alt! expands to a somewhat elaborate expression using alts!; apart from the syntactic convenience, it offers no extra functionality.