Question

我正在尝试从random-number-csprng API返回一个随机数，并将其发送到控制台，但不在模块外部。如何比较另一个模块内部模块的值？

我试图从.then（）函数返回number参数，但是它仍然没有超出函数范围。

const Promise = require("bluebird");
const randInt = require("random-number-csprng");

class project {
    constructor(uname) {
        this.uname = uname;
    }

    randomNumber(lowest, highest)
    {
        Promise.try(() => {
            return randInt(lowest, highest);
        }).then(number => {
            console.log("Your random number:", number);
        }).catch({code: "RandomGenerationError"}, err => {
            console.log("Something went wrong!");
        });
    }

    checkRandom()
    {
        console.log(`This is a test: ${this.randomNumber(1,100)}`);

        if(this.randomNumber(1, 100) > 1)
        {
            console.log(`Works!`);
        }
        else
        {
            console.log(`Does not work!`);
        }
    }
}

输出

This is a test: undefined
Your random number: 65
Your random number: 71

我希望在未定义的日志中输出为65，但似乎不会存储在Promise.try()之外

Answer 1

我看到您从字面上有点遵循他们文档中的示例代码。您需要从方法中返回promise，并通过await对其进行异步使用：

const randInt = require('random-number-csprng');

class Project {
  constructor(uname) {
    this.uname = uname;
  }

  randomNumber(lowest, highest) {
    return randInt(lowest, highest);
  }

  async checkRandom() {
    const randomValue = await this.randomNumber(1,100);

    console.log(`This is a test: ${randomValue}`);

    if (randomValue > 1) {
      console.log('Works!');
    } else {
      console.log('Does not work!');
    }
  }
}

如何从模块获取值，返回未定义的值

1 个答案: