详细讲解如何从零开始实现前端Promise，包含代码作用解析和与浏览器自带Promise的对比测试。
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视频特点：很详细的讲解每一步的代码都有什么作用，每完成一部分会进行测试，跟浏览器自带的 Promise 进行对比视频地址：https://www.bilibili.com/video/BV18Z4y127UW?share_source=copy_web
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