在操纵up中获取元素的子代

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So my goal here is to count the number of children of a div class that has inside it multiple div's; I do that by selecting the div then using the children attribute, and then I count the children with their length property and print it.

为了实现我的目标，我试图在puppeteer中实现以下代码：

$('div[data-test-selector="center-window__content"]').children

（可在chrome调试控制台上完美运行）

这是我转换后的代码：

let childrens = await page.evaluate(() => document.querySelector('div[data-test-selector="center-window__content"]'), i => Array.from(i.children));

However this expression evaluates to undefined.

On their documentation for evaluate it is said that:

如果传递给page.evaluate的函数返回不可序列化的值，则page.evaluate解析为undefined。

是这样吗？我该如何解决？

提前致谢。