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让你从头到尾把promise整的明明白白
source link: https://juejin.im/post/5cdd4892f265da038412b4ea
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最近一直私下在看Android项目，前端这一块没怎么仔细研究。昨天在写重构公司前端项目的时候，我发现一旦有异步的任务，脑海里面条件反射一般的出现promise的字样。重构的多了 心就就在纳闷：既然promise这么好用，我能不能自己手写一个promise呢？我
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