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一直有个疑问，用 nodejs 时有什么优雅的办法能让代码在流程上回避掉回调吗？
source link: https://www.v2ex.com/t/527385
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Node.js - @tomoya92 - 虽然现在 ES 标准里加上了 async await 来实现同步操作，还有 Promise，但业务复杂了，代码还是会被各种回调弄的执行流程出问题举个例子写 js 的时候用的最多的应该就
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