如何在 Puppeteer 中使用 return 和 page.goto？

Question

I'm using return inside await page.goto in Puppeteer and I don't know why return doesn't work. Here's a code sample:

This line below doesn't work:

return elements // return data collected

Full code:

 /* --- Lógica para coletar os dados de cada página --- */
        await page.goto(url, { waitUntil: 'networkidle0' })
        let data = await page.evaluate(() => {
            const root = Array.from(document.querySelectorAll('tr.team'))
            let elements = root.map((e) => ({
                id: Math.random().toString(16).slice(2),
                date: new Date().toJSON().slice(0, 10).replace(/-/g, '/'),
                teamName: e.querySelector('td.name').innerText,
                wins: e.querySelector('td.wins').innerText,
                loses: e.querySelector('td.losses').innerText,
            }))
            // console.log('console.log(elements)') // DEBUG
            console.log('return elements executado') // DEBUG
            return elements // return data collected
        })

How do make return work?

Answer 1

I found the answer. My let in .push was wrong.

After this block code:

return elements // return data collected

My .push stay targeted to dataFromPages.push(...elements) .

My array return was empty. This is a beginner wrong.

I put the right way, dataFromPages.push(...data) with data let.

Thank you guys.

Full correct code to help community:

for (let i = 0; i < urls.length; i++) {
        let url = urls[i]
        console.log(`Coletando dados da url: ${chalk.underline(url)}`)

        /* --- Lógica para coletar os dados de cada página --- */
        await page.goto(url, { waitUntil: 'networkidle0' })
        let data = await page.evaluate(async () => {
            const root = Array.from(document.querySelectorAll('tr.team'))
            let elements = root.map((e) => ({
                id: Math.random().toString(16).slice(2),
                date: new Date().toJSON().slice(0, 10).replace(/-/g, '/'), //TODO: Colocar a HORA também
                teamName: e.querySelector('td.name').innerText,
                wins: e.querySelector('td.wins').innerText,
                loses: e.querySelector('td.losses').innerText,
            }))
            return elements // return data collected
        })
        dataFromPages.push(...data)
    }