NodeJS Puppeteer "ReferenceError: page is not defined"

Question

我遇到了与这段特定代码相关的问题：

(async() => {
    const browser = await puppeteer.launch({headless: false});
    const page = await browser.newPage();
    await page.goto(arr[0]["link"]);
    sleep(5000);
    const claim = await page.evaluate(() => {

它向我发送了这个错误（最上面的最后一行是第 23 行）：

C:\Users\root\Documents\Workspace\NodeJS Scrapper\node_modules\puppeteer\lib\cjs\puppeteer\common\ExecutionContext.js:221
            throw new Error('Evaluation failed: ' + helper_js_1.helper.getExceptionMessage(exceptionDetails));
                  ^

Error: Evaluation failed: ReferenceError: page is not defined
    at __puppeteer_evaluation_script__:4:13
    at ExecutionContext._evaluateInternal (C:\Users\root\Documents\Workspace\NodeJS Scrapper\node_modules\puppeteer\lib\cjs\puppeteer\common\ExecutionContext.js:221:19)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async ExecutionContext.evaluate (C:\Users\root\Documents\Workspace\NodeJS Scrapper\node_modules\puppeteer\lib\cjs\puppeteer\common\ExecutionContext.js:110:16)
    at async C:\Users\root\Documents\Workspace\NodeJS Scrapper\part2.js:23:19

这是我的完整代码：

const puppeteer = require('puppeteer');

function sleep(milliseconds) {
    const date = Date.now();
    let currentDate = null;
    do {
        currentDate = Date.now();
    } while (currentDate - date < milliseconds);
}

const fs = require('fs');
const data = fs.readFileSync('./games.txt', 'utf8');
const arr = JSON.parse(data);

console.log(arr);

(async() => {
    const browser = await puppeteer.launch({headless: false});
    const page = await browser.newPage();
    await page.goto(arr[0]["link"]);
    sleep(5000);
    
    const claim = await page.evaluate(() => {
        let claim = [];
        if(document.querySelector('div.css-xvql1u button.css-n9sjaa span').textContent == "Continuer") {
            page.click("div.css-xvql1u button.css-n9sjaa");
        }
        sleep(15000);
        return claim;
    });
    await browser.close();
    console.log(claim);
})();

文件“games.txt”包含这个数组：

[{"title":"Mages of Mystralia","link":"https://www.epicgames.com/store/fr/p/mages-of-mystralia"}]

你能帮我解决这个问题吗？

Answer 1

好了，问题就上线了：

page.click("div.css-xvql1u button.css-n9sjaa");

page.evaluate 运行您在网页上下文中提供的功能。（意思是上面闭包中的变量 page 没有定义。）

您应该将该行替换为类似以下内容：

document.querySelector("div.css-xvql1u button.css-n9sjaa").click()

或者，如果您真的坚持使用 page 标识符或人偶脚本中的任何其他值，您可以将其作为参数传递给函数。 (check here for an example)

NodeJS Puppeteer "ReferenceError: page is not defined"

NodeJS Puppeteer "ReferenceError: page is not defined"

node.js

puppeteer