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25行代码实现Promise函数
source link: https://juejin.im/post/5a13f6b2f265da43294dad7d
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说明 Promise函数对node后端和前端的重要性就不必多说了，很大一部分程度上解决了恶心的嵌套的回调!现在跟着我来写一个简单的Promise函数吧！ 使用阮一峰老师说的非常好了，有点忘记的同学传送门进去 开始不啰嗦直接上代码，给你个眼神自己去体会 clas
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