Question

所以我想用 Playwright 做一些非常简单的事情，我只需要从我用 csv 制作的数组中访问网站

var csvsync = require('csvsync');
var fs = require('fs');
 
var csv = fs.readFileSync('sites.csv');
var data = csvsync.parse(csv);

const { chromium } = require('playwright');

(async () => {

const promises = [];


  const browser = await chromium.launch({
    headless: false
  });
  const context = await browser.newContext();

  // Open new page
  const page = await context.newPage();

  for(let i = 0; i <= data.length; i++) {
      // Go to https://www.google.com.br/?gws_rd=ssl
      await page.goto(`${data[i]}`);

      await Promise.all(promises);
  }
  await Promise.all(promises);
  // ---------------------
  await context.close();
  await browser.close();
})();

那么，它有什么问题？

Answer 1

对 aysnc for 循环的更全面的回答在这里：Asynchronous Process inside a javascript for loop

但简而言之：

//Helper function
async function asyncForEach (array, callback) {
    for (let index = 0; index < array.length; index++) {
        await callback(array[index], index, array);
    }
};

//usage
await asyncForEach( data, async d => {
    await page.goto(d);
});

如何使用 Playwright 在异步函数中进行循环？

1 个答案: