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我正在尝试使用page.$$eval()从 a 获取数据<ul>，将值存储在两个数组中，然后遍历数组以将数据放入键/值对中。我正在努力将数据放入数组中。

HTML 如下所示：

<ul class="b-profile__sections">
    <li class="b-profile__sections__item">
        <span class="b-profile__sections__link">
            <span class="b-profile__sections__count">585</span>
            <span class="b-profile__sections__name"> Posts </span>
        </span>
    </li>
    <li class="b-profile__sections__item">
        <span class="b-profile__sections__link m-no-hover">
            <span class="b-profile__sections__count">110.3K</span>
            <span class="b-profile__sections__name"> Likes </span>
        </span>
    </li>
</ul>

我的代码：

let user = {};
let properties = [];
let values = [];
await page.$$eval('.b-profile__sections__name', (elems, properties) => elems.forEach(elem => {
    properties.push(elem.innerText); // push result into array
}), properties) // array passed as argument to page.$$eval()
await page.$$eval('.b-profile__sections__count', (elems, values) => elems.forEach(elem => {
    values.push(elem.innerText); // push result into array
}), values) // array passed as argument to page.$$eval()
for (let i = 0; i < properties.length; i++) {
    user[properties[i]] = values[i] //iterate through arrays to make key/value pairs
}

错误：

Error: Evaluation failed: ReferenceError: values is not defined
    at __puppeteer_evaluation_script__:2:37
    at Array.forEach (<anonymous>)
    at __puppeteer_evaluation_script__:1:19

或者：

Error: Evaluation failed: TypeError: Cannot read property 'push' of undefined
    at __puppeteer_evaluation_script__:2:44
    at Array.forEach (<anonymous>)
    at __puppeteer_evaluation_script__:1:27

我猜这与浏览器（传递给的函数page.$$eval()）/Node.js（两个数组）上下文有关。有没有更好的办法？

4

1 回答 1

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let properties = await page.$$eval('.b-profile__sections__name', elems => elems.map(elem => elem.innerText));

let values = await page.$$eval('.b-profile__sections__count', elems => elems.map(elem => elem.innerText));

for (let i = 0; i < properties.length; i++) {
 user[properties[i]] = values[i]
}
于 2020-12-23T11:50:31.037 回答