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【小小前端】手写一个很简单的异步编程解决方案Promise及其链式调用
source link: https://juejin.im/post/5e255c526fb9a02ffe7031be
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前端异步一直是个热门话题，作为新一代异步编程解决方案的Promise，相比传统异步编程，不仅解决了恐怖的回调地狱，在写法上也是相当方便简洁。如此牛*的功能让人不禁地想一探究竟，在各大网络公司面试中，手写Promise也是常见的笔试题了，就让我们一起来简单探讨一
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