API调用期间的NodeJs MaxListenersExceededWarning

Question

我正在用风数据（从 API JSON 中抓取）填充一个数组，但出现错误MaxListenersExceededWarning。我已经查过了，这似乎是由于代码中的错误造成的。解决方法是设置setMaxListeners(n);，但显然不推荐这样做。任何人都可以看到是什么导致注册了这么多听众吗？什么是解决方案？我正在创建一个在请求时吐出数组的 API windRecordings。代码const getWindForecast = (windRecordings) => {  setInterval(() => {    const instantWind = scrapeAPI(      "http://mobvaer.kystverket.no/v2/api/stations/5265049"    );    instantWind.then((res) => {      if (windRecordings.length > 0) {        // A wind value(s) is already pushed to the list        const latestRecordedWind = windRecordings[windRecordings.length - 1]; // get the first element out                // Compare the lates wind value in the list to the lates API request wind value        if (          latestRecordedWind[1]["Value"]["Value"] == res[1]["Value"]["Value"]        ) {          console.log("They are the same");        } else {            console.log("They are not the same, push them.")          windRecordings.push(res);        }      } else {        // The length is less than 0, no element has been added so far, push element        console.log("Push the first to the list");        windRecordings.push(res);      }    });    return windRecordings;  }, 1000);};错误MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 exit listeners added to [process]. Use emitter.setMaxListeners() to increase limit(node:85830) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGINT listeners added to [process]. Use emitter.setMaxListeners() to increase limit(node:85830) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGTERM listeners added to [process]. Use emitter.setMaxListeners() to increase limit(node:85830) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGHUP listeners added to [process]. Use emitter.setMaxListeners() to increase limit  });

Answer 1

您每秒都在启动一个新的浏览器实例，并且不要关闭它们。

您的代码执行此操作：

  setInterval(() => {

    //const instantWind = scrapeAPI();

...

  const browser = await puppeteer.launch();

...

  }, 1000);

您需要关闭重用浏览器实例或至少关闭它们：

const scrapeAPI = async (url) => {

  const browser = await puppeteer.launch();

  const page = await browser.newPage();

  await page.goto(url);

  var content = await page.content();

  innerText = await page.evaluate(() => {

    return JSON.parse(document.querySelector("body").innerText);

  });

  const instantWind = innerText["Instantaneous"];

await browser.close();

  return instantWind;

};