nodejs puppeteer如何在iframe中输入输入？

Question

我正在尝试在网站上键入用户名，但输入框位于iframe内，我曾尝试使用此代码在iframe中定位该元素，但始终收到错误JSHandles can be evaluated only in the context they were created!

const puppeteer = require('puppeteer');
(async () => {
  const browser = await puppeteer.launch({headless: false});
  const page = await browser.newPage();
  await page.goto("www.examplesite.com", { waitUntil: 'networkidle0' })
  await sleep(1000)
  const myframe = await page.frames()[2];        
  const userselector = await myframe.$('input[name="usernameinput"]')
  await page.type(userselector, "myusername")
  await page.screenshot({path: 'example.png'});
  await browser.close();
})();

Answer 1

type函数需要选择器字符串而不是句柄。因此，由于框架还具有type函数，您可以执行以下操作：

await myframe.type('input[name="usernameinput"]', "myusername")