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老哥们，js的回调函数怎么看出是同步的还是异步的？
source link: https://www.zhihu.com/question/403703462/answer/1875306008
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老哥们，js的回调函数怎么看出是同步的还是异步的？
有些回调函数是同步调用，有些则是异步。为什么？js引擎是通过什么判断的？求解答。
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