For 循环运行 puppeteer 函数无序

发布于 2025-01-17 06:43:45 字数 438 浏览 3 评论 0原文

我有一个包含 puppeteer 函数的循环。问题是循环同时执行所有操作。

我已经尝试过：

import puppeteer from "puppeteer"

(async function(){
    for(let i = 0; i < 3; i++){
        await launchPup().then(() => {
        });
    }
})()

async function launchPup() {
    puppeteer.launch({headless: false}).then(async browser => {
        await browser.newPage()
        await browser.close()
    })
}

你能告诉我我做错了什么以及如何解决这个问题吗？

原文

I have a loop which contains an puppeteer function.
The problem is that the loop is doing all puppeteer at the same time.

I've tried this:

import puppeteer from "puppeteer"

(async function(){
    for(let i = 0; i < 3; i++){
        await launchPup().then(() => {
        });
    }
})()

async function launchPup() {
    puppeteer.launch({headless: false}).then(async browser => {
        await browser.newPage()
        await browser.close()
    })
}

Could you tell me what I'm doing wrong and how can fix this?

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紫轩蝶泪 2025-01-24 06:43:45

这是一个异步函数，您必须留意创建的浏览器。

像这样的事情应该有帮助：

var totalOpenedbrowser = 0;
var minBrowser = 2;
const wait = () => new Promise((resolve) => setTimeout(resolve, 200))

(async function() {
  for (let i = 0; i < 3; i++) {

    await launchPup().then(() => {});
  }
})()



async function launchPup() {
  while (totalOpenedbrowser > = minBrowser)
    await wait(); // wait until there is a free slott
  totalOpenedbrowser++;
  puppeteer.launch({
    headless: false
  }).then(async browser => {
    await browser.newPage()
    await browser.close()
    totalOpenedbrowser--;
  })
}

看看我构建的库，它将解决您的问题：
https://www.npmjs.com/package/puppeteer-express

It's an async function, you have to keep a look out at the created browser.

Something like this should help:

var totalOpenedbrowser = 0;
var minBrowser = 2;
const wait = () => new Promise((resolve) => setTimeout(resolve, 200))

(async function() {
  for (let i = 0; i < 3; i++) {

    await launchPup().then(() => {});
  }
})()



async function launchPup() {
  while (totalOpenedbrowser > = minBrowser)
    await wait(); // wait until there is a free slott
  totalOpenedbrowser++;
  puppeteer.launch({
    headless: false
  }).then(async browser => {
    await browser.newPage()
    await browser.close()
    totalOpenedbrowser--;
  })
}

Have a look at the library I build, it will solve your issue:
https://www.npmjs.com/package/puppeteer-express

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