开始打开网页2021-12-22T09:32:19.799Z [verbose] 访问url次数 1 2021-12-22T09:32:32.340Z [verbose] 标签页 32021-12-22T09:33:09.763Z [verbose] 浏览器错误 { Error: Protocol error (Runtime.callFunctionOn): Target closed. at Promise (/code/node_modules/puppeteer/lib/Connection.js:183:56) at Promise (null:null:null) at send (/code/node_modules/puppeteer/lib/Connection.js:182:12) at _evaluateInternal (/code/node_modules/puppeteer/lib/ExecutionContext.js:107:44) at evaluateHandle (/code/node_modules/puppeteer/lib/ExecutionContext.js:57:17) at (/code/node_modules/puppeteer/lib/helper.js:112:23) at rerun (/code/node_modules/puppeteer/lib/DOMWorld.js:570:65) at _tickCallback (internal/process/next_tick.js:68:7) message: 'Protocol error (Runtime.callFunctionOn): Target closed.' }2021-12-22T09:33:09.764Z [error] (node:23) UnhandledPromiseRejectionWarning: Error: Protocol error (Network.getCookies): Session closed. Most likely the page has been closed. at send (/code/node_modules/puppeteer/lib/Connection.js:180:29) at cookies (/code/node_modules/puppeteer/lib/Page.js:382:32) at (/code/node_modules/puppeteer/lib/helper.js:112:23) at Promise (/code/aicard-event.js:367:28)2021-12-22T09:33:09.764Z [error] (node:23) 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: 2)2021-12-22T09:33:09.764Z [error] (node:23) [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.FC Invoke End RequestId: , Error: Function timed out after 120 seconds (maxMemoryUsage: 0MB)我这块在第一次打开页面的时候waitForFunction报错提示超时，于是我会再重试一次，这个时候waitForFunction就会报Protocol error (Runtime.callFunctionOn): Target closed.,这个问题我十次里面会遇到一两次，想问问这个是为啥啊，我中间url啥的都没改，就只是重新再page.goto一次，为什么会提示这个错误呢。还有一个问题，这个是我这个方法的结构，我上面waitForFunction报错之后进入catch，在这里面获取cookie，但是目标关闭导致失败，这个时候什么会提示后面的错误，我想问问我这个不是写了reject吗，完了在调用toPDF时也写了.then().catch()，请问这个正确的写法该是怎样的呢function toPDF() { return new Promise((resolve, reject) => { for (let i = 0; i < 2; i++) { try { //打开页面生成pdf resolve() } catch (e) { // 获取cookie } } reject(error) })}psfunction convertToPDF(url, context) { // 生成browser return new Promise(async (resolve, reject) => { let browser for (let i = 0; i < 2; i++) { console.log('开始生成浏览器和页面'); let page let nowTime try { if (!browser) { browser = await puppeteer.launch({ headless: true, ignoreHTTPSErrors: true, args: [ '--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage', ], executablePath: '/mnt/fun/fun/local-chromium/Linux-706915/chrome-linux/chrome' }) } page = await browser.newPage(); //将超时时间设置成无限 page.setDefaultTimeout(0); page.setDefaultNavigationTimeout(0); console.log('开始打开网页'); for (let urlNumber = 1; urlNumber < 6; urlNumber++) { try { console.log('访问url次数', urlNumber, ':', url) // 等待网页所有请求结束 nowTime = new Date().getTime() / 1000 await page.goto(url, {waitUntil: 'networkidle0'}); break } catch (e) { console.log('打开url错误开始重试') console.log(e) if (urlNumber >= 5) { console.log('打开url失败') } } } //设置监控 const tags = browser.pages() console.log('标签页', (await tags).length) // 等网页加载成功,超时时间45s const watchDog = page.waitForFunction('window.status == "loaded"', {timeout: 45 * 1000}); await watchDog //检查是否生成失败 let error = null; await page.cookies().then(cookies => { console.log('是否成功'); for (let cookie of cookies) { if (cookie.name === 'errorMessage') { error = cookie.value; break; } else if (cookie.name.indexOf('debugMsg') >= 0) { console.log(JSON.stringify(cookie.value)); } } }) error = error === null ? null : JSON.parse(error); //如果失败 if (error !== null && error.errorType === 0) { console.log('失败123'); console.log('失败', JSON.stringify(error)); // 关闭browser await browser.close(); } //如果成功 else { console.log('生成pdf'); // 生成pdf await page.pdf({ path: outputFile, format: 'A4', printBackground: true, margin: {top: 0, right: 0, bottom: 0, left: 0}, preferCSSPageSize: true }); // 关闭browser await browser.close(); resolve(outputFile); } break } catch (e) { console.log('浏览器错误', e) await page.cookies(url).then(cookies => { cookies.forEach(cookie => { console.log(cookie.name, Number(cookie.value) - nowTime); }) }) } } reject('pdf错误') })}