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Q：你了解异步编程、进程、单线程、多线程吗？
source link: https://juejin.im/post/5a1b664df265da432a7b4b9d
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相关定义 Javascript语言将任务的执行模式分成两种：同步（Synchronous）和异步（Asynchronous）。 同步：一个进程在执行某个请求的时候，若该请求需要一段时间才能返回信息，那么这个进程将会一直等待下去，直到收到返回信息才继续执行
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