Question

现在我有

getUserInfo = (data) => {
    console.log('Getting user info')
    return new Promise((resolve, reject) => {
        if (data === 1)
        return resolve('Hello World')
        resolve(getUserInfo(1))
    })
}

getUserInfo().then(data => console.log(data))

这将是console.log Getting user info Getting user info Hello World

这正是我想要的，多次致电承诺然后解决。

但是我想在承诺之间添加延迟，所以我希望： Getting user Info Wait 1 second Getting user Info Hello World

我想使用蓝鸟的Promise.delay。有关如何去的任何提示？

我试过

getUserInfo = (data) => {
    console.log('Getting user info')
    return new Promise.delay(500,(resolve, reject) => {
        if (data === 1)
        return resolve('Hello World')
        resolve(getUserInfo(1))
    })
}

但是作为promise的解析数据会返回Function： Getting user info [Function]

提前谢谢！

Answer 1

延迟是一个承诺，而不是承诺构造函数。所以你可以像任何其他承诺一样使用Promise.delay ..

以下可能是你的 - ＆gt;

const getUserInfo = (data) => {
    console.log('Getting user info')
    return new Promise((resolve, reject) => {
        if (data === 1) {
          return resolve('Hello World')
        }
        return Promise.delay(500).then(
           function ()  { resolve(getUserInfo(1)); }
        );
    })
}

getUserInfo().then(data => console.log(data))

<script src="https://cdnjs.cloudflare.com/ajax/libs/bluebird/3.5.1/bluebird.min.js"></script>

使用新的async / await，可以使这样的事情变得更容易。

const getUserInfo =  async (data) => {
    console.log('Getting user info')
    if (data === 1) return "hello World";
    await Promise.delay(500);
    return getUserInfo(1);
}

getUserInfo().then(data => console.log(data))

<script src="https://cdnjs.cloudflare.com/ajax/libs/bluebird/3.5.1/bluebird.min.js"></script>

使用延迟Bluebird.js多次调用promise

1 个答案: