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细说JS异步发展历程

 5 years ago
source link: https://juejin.im/post/5ce40e5ee51d4556be5b39b7
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neoserver,ios ssh client
知其然知其所以然，首先了解三个概念： 1.什么是同步？ 所谓同步，就是在发出一个"调用"时，在没有得到结果之前，该“调用”就不返回。但是一旦调用返回，就得到返回值了。换句话说，就是由“调用者”主动等待这个“调用”的结果。此调用执行完之前，阻塞之后的代码执行。

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