如何使用承诺调用函数 [英] How to call a function with a promise

问题描述

我对 JS 还很陌生，我正在尝试理解 npm 包中的文档.文档是:

I'm fairly new to JS and I'm trying to understand the documentation in a npm package. The documentation is:

client.projects.get();//承诺

我已经阅读了一些关于 Promises 的文档，但我仍然不确定如何调用它并让它返回我所期望的.

I've read some documentation on Promises, but I'm still not sure how to call this and get it to return what I am expecting.

参考包在这里:https://github.com/markmssd/bitbucket-server-nodejs

推荐答案

Promise 是代码的异步执行.

您可以使用 Promise 上的 .then 方法获取从异步代码返回的值.您必须传递处理返回值的回调函数.

You can get the value returned from that async code using .then method on a Promise. You will have to pass the callback function which handles the value returned.

client.projects.get().then(function(foo) {
// this foo is returned from client.projects.get() async operation
})

如果异步操作抛出了一些异常，您可以在承诺上使用 .catch 捕获那些异常.

In case that async operation threw some Exception, you can catch those using a .catch on a promise.

client.projects.get().then(function(foo) {
    // this foo is returned from client.projects.get() async operation
}).catch(function(err) {
   // something went wrong while executing client.projects.get()
})

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