puppeteer 簡單互動範例： 下載環保署空氣品質監測網資料

airtw-scraper.js

#!/usr/bin/env node
// http://toddhayton.com/2018/08/01/scraping-with-puppeteer/
// airtw-scraper.js https://www.cwb.gov.tw/V7/observe/real/46757.htm > a.htm

const homedir = require('os').homedir();
const puppeteer = require(homedir + '/node_modules/puppeteer');
const url = 'https://airtw.epa.gov.tw/';

async function main() {
    const browser = await puppeteer.launch();
    const page = await browser.newPage();

    await page.goto(url);
    await page.waitForSelector('body');
    await page.click('#ddl_county')
    await page.waitFor(4000)
    await page.select('#ddl_county', 'Kaohsiung');
    //await page.waitForSelector('#ddl_site');
    await page.waitFor(8000)
    await page.click('#ddl_site');
    await page.waitFor(2000)
    await page.select('#ddl_site', '17');
    await page.waitFor(2000)
    console.log(await page.content());
    await browser.close();    
}

main();

const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto(url, { waitUntil: 'networkidle2' });
await page.select('#ddl_county', 'Kaohsiung');
await page.select('#ddl_site', '17'); //左營
await page.waitForResponse('https://airtw.epa.gov.tw/ajax.aspx')
let areaInfo = await page.$('#th_area aside > div');
await areaInfo.screenshot({ path: 'example.png' }); //截圖檢查是否正確
await browser.close();

我用waitForResponse測試起來是可行