如何将变量传递给 puppeteer page.$eval(); [英] how to pass a variable to puppeteer page.$eval();

问题描述

我声明了一个变量，我试图将它传递给一个 eval 但它没有显示出来.如何正确传递变量.

I declared a variable and I am trying to pass it into an eval but it does not get displayed. How can I properly pass a variable.

var now = moment().format('YYYY-MM-D');
await page.$eval('#middleContent_txtEndDate', el => el.value = now);

如果我在 eval 函数中声明一个变量，它会起作用:

If I declare a variable inside the eval function it works:

var now = moment().format('YYYY-MM-D');
await page.$eval('#middleContent_txtEndDate', el => el.value = "it works");

推荐答案

你可以通过 附加参数，到 $eval

const now = moment().format('YYYY-MM-D');

await page.$eval('#middleContent_txtEndDate', (el, now, foo) => {
   console.log(el, now, foo);
   return el.value = now;
}, now, 'foo');

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