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Promise不会？？看这里！！！史上最通俗易懂的Promise！！！

 5 years ago
source link: https://juejin.im/post/5afe6d3bf265da0b9e654c4b
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一、什么是Promise？我们用Promise来解决什么问题？Promise 是异步编程的一种解决方案： 从语法上讲，promise是一个对象，从它可以获取异步操作的消息；从本意上讲，它是承诺，承诺它过一段时间会给你一个结果。 promise有三种状态：pen

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