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docs(Promise): edit Promise
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docs/promise.md

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@@ -40,7 +40,7 @@ var promise = new Promise(function(resolve, reject) {
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`resolve`函数的作用是,将`Promise`对象的状态从“未完成”变为“成功”(即从 Pending 变为 Resolved),在异步操作成功时调用,并将异步操作的结果,作为参数传递出去;`reject`函数的作用是,将`Promise`对象的状态从“未完成”变为“失败”(即从 Pending 变为 Rejected),在异步操作失败时调用,并将异步操作报出的错误,作为参数传递出去。
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`Promise`实例生成以后,可以用`then`方法分别指定`Resolved`状态和`Reject`状态的回调函数。
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`Promise`实例生成以后,可以用`then`方法分别指定`Resolved`状态和`Rejected`状态的回调函数。
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```javascript
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promise.then(function(value) {

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