我正在玩mailchimp API。代码片段将用户添加到邮件列表中，然后会显示成功或失败消息。不幸的是，我无法掌握状态代码。似乎在添加用户成功或失败的情况下，我会得到不同的响应。如果成功，我可以通过response.statusCode访问状态，但在失败的情况下，这不起作用：

const express = require('express');
const request = require('request');
const bodyParser = require('body-parser');
const https = require('https');
const mailchimp = require("@mailchimp/mailchimp_marketing");

const app = express();
//Includes local/static files
app.use(express.static('public'));
// Ads body parser and the function to read posted data
app.use(bodyParser.urlencoded({extended: true}));

mailchimp.setConfig({
  apiKey: "XXX",
  server: "us10",
});

app.get('/', function(req, res){
  res.sendFile(__dirname+'/sign_up.html');
});

app.post('/', async function(req, res) {

  //Audience ID
  const listId = 'XXX'

  const response = await mailchimp.lists.addListMember(listId, {
  email_address: req.body.email,
  status: "subscribed",
  merge_fields: {
    FNAME: req.body.firstName,
    LNAME: req.body.lastName
  }
});

  console.log(response.statusCode);

  if (response.statusCode == 200) {
    res.send(response.statusCode);
  } else {
    res.send(response.statusCode);
  }
})

app.listen('3000', function() {
  console.log('Hello World');
})

顺便问一下，为什么mailchimp使用异步函数？
感谢您的支持！
贝斯特马蒂亚斯