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Promise晋级—完全吃透
source link: https://juejin.im/post/5bb4a8f25188255c9538419e
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Promise Promise晋级，需要的全部都在这 主要内容： promise基本实现原理 promise 使用中难点（链式调用，API基本上返回都是一个新Promise，及参数传递） promise 对异常处理 promise 简单实现及规范 参考：
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