added code example

content/docs/2023/mediaart-programming2/10/3_map_async.js

@@ -0,0 +1,21 @@
+const puppeteer = require('puppeteer');
+
+const take_screen_shot = async (browser, url, index) => {
+    let page = await browser.newPage();
+    let path = `${index}.png`;
+    await page.goto(url);
+    await page.screenshot({ path: path });
+    await page.close();
+}
+
+const main = async () => {
+    let browser = await puppeteer.launch({ headless: false ,args: ["--window-size=1920,1080"],timeout:0});
+    const urllist = ["https://www.youtube.com",
+        "https://www.google.com",
+        "https://www.geidai.ac.jp",
+        "https://yahoo.co.jp"]
+    await Promise.all(urllist.map((url, index) => take_screen_shot(browser, url, index)));
+    await browser.close();
+}
+
+main();