这是我之前问过的一个问题的扩展。

我从基于 node.js 构建的 API 获取了一些数据。

我想将这些数据保存到 csv。我遇到的问题是我从 API 获取数据并已验证了这一点（console.log 显示这一点）。csv 也正在创建，但问题是 csv 中没有任何内容，它是一个空白的 csv。

这是我编写的代码；

const boxrec = require("boxrec").Boxrec;
const fastcsv = require('fast-csv');
const fs = require('fs');
async function getCookieJar(){
    try {
        const cookieJar = await boxrec.login('***','******');
        return cookieJar;
    } catch (e) {
        console.log("Login error: " + e);
    }
};
async function writeData() {
    const cookieJar = await getCookieJar();
    var boxers = await boxrec.getPersonById(cookieJar,356831);
    const ws = fs.createWriteStream("C:\\Users\\User\\Documents\\testing2.csv");
    fastcsv
    .write(boxers, {headers: true })
    .pipe(ws);
};
try {
    writeData();
} catch (error) {
    console.log("Error in function " + error);
}

运行代码也会产生此错误消息：

(node:15672) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)(node:15672) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

更新。

我在 writeData 中添加了 try、catch，这是我收到的错误消息：

(node:4264) UnhandledPromiseRejectionWarning: TypeError: rows.reduce is not a function
    at Object.exports.write (C:\Users\User\node_modules\fast-csv\build\src\formatter\index.js:20:10)
    at writeData (C:\Users\User\Documents\index.js:17:6)
(node:4264) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:4264) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

console.log(boxers) 返回此：

r {
  '$': [Function: initialize] {
    fn: initialize { constructor: [Circular], _originalRoot: [Object] },
    load: [Function],
    html: [Function],
    xml: [Function],
    text: [Function],
    parseHTML: [Function],
    root: [Function],
    contains: [Function],
    merge: [Function],
    _root: {
      type: 'root',
      name: 'root',
      namespace: 'http://www.w3.org/1999/xhtml',
      attribs: [Object: null prototype] {},
      'x-attribsNamespace': [Object: null prototype] {},
      'x-attribsPrefix': [Object: null prototype] {},
      children: [Array],
      parent: null,
      next: null
    },
    _options: {
      withDomLvl1: true,
      normalizeWhitespace: false,
      xml: false,
      decodeEntities: true
    }
  }
}