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topicUrls的forEach 循环和superagent有冲突，导致部分res没有值。 谨慎在for循环里使用异步方法。用递归代替循环可以避免出现以上问题。
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topicUrls的forEach 循环和superagent有冲突，导致部分res没有值。
谨慎在for循环里使用异步方法。用递归代替循环可以避免出现以上问题。