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「硬核JS」深入了解异步解决方案
source link: https://juejin.im/post/5e4613b36fb9a07ccc45e339
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前言 Javascript语言的执行环境是单线程(single thread，指一次只能完成一件任务，如果有多个任务，就必须排队，前面一个任务完成，再执行后面一个任务，以此类推) 这种模式的好处是实现起来比较简单，执行环境相对单纯，坏处是只要有一个任务耗时很长
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