Javascript Puppeter始终未定义,但devtools适用于嵌套节点列表
我是木偶演员的新手,不太确定我在这里做错了什么,但在开发工具中,我得到了正确的输出。然而,我希望用这些值创建一个文件,并继续得到未定义的Javascript Puppeter始终未定义,但devtools适用于嵌套节点列表,javascript,node.js,dom,web-scraping,puppeteer,Javascript,Node.js,Dom,Web Scraping,Puppeteer,我是木偶演员的新手,不太确定我在这里做错了什么,但在开发工具中,我得到了正确的输出。然而,我希望用这些值创建一个文件,并继续得到未定义的 我认为这与节点列表和无法返回它们有关,但我不知道如何修复它 这在DevTools中起作用: let arr2 = Array.from(document.querySelectorAll( "#data > div.data-wrapper > div > div > table > tbody tr")) .map(row
我认为这与节点列表和无法返回它们有关,但我不知道如何修复它
这在DevTools中起作用:
let arr2 = Array.from(document.querySelectorAll(
"#data > div.data-wrapper > div > div > table > tbody tr"))
.map(row => (
{site:row.querySelector('td:nth- child(2)').innerText,
pass:row.querySelector('td:nth- child(10)').innerText,
user:row.querySelector('td:nth-child(9)').innerText
}))
//with a console.log()
我还尝试了row.evaluate(()=>)
,但这对我不起作用
以下是我的代码,它不起作用:
(async () => {
const browser = await puppeteer.launch({ headless: false });
const page = await browser.newPage();
await page.authenticate({ username: "username", password: "password" });
await page.goto("https://website/.../all");
await page.waitFor(120000); // beacuse It loads everything slowly and times out the default 30000
console.log("started evalating");
var data = await page.evaluate(() => {
Array.from(
document.querySelectorAll(
"#data > div.data-wrapper > div > div > table > tbody tr"
)
).map(row => {
return {
site: row.querySelector("td:nth-child(2)").innerText,
pass: row.querySelector("td:nth-child(10)").innerText,
user: row.querySelector("td:nth-child(9)").innerText
};
});
});
console.log(data);
})();
//I want an array of objects but the result throws errors or comes back with [undefined,......]
传递给的page函数缺少语句,因此不返回值。因此,变量
数据
为
有两个额外的细节需要注意:
Array.from(arrayLike, mapFn) // good
Array.from(arrayLike).map(mapFn) // bad
let data = ... // good
var data = ... // bad
'use strict';
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({
headless: false,
});
const page = await browser.newPage();
await page.authenticate({
username: 'username',
password: 'password',
});
await page.goto('https://website/.../all');
await page.waitFor(120000);
console.log('started evalating');
let data = await page.evaluate(() => {
return Array.from(
document.querySelectorAll('#data > div.data-wrapper > div > div > table > tbody tr'),
row => ({
site: row.querySelector('td:nth-child(2)').innerText,
pass: row.querySelector('td:nth-child(10)').innerText,
user: row.querySelector('td:nth-child(9)').innerText,
})
);
});
console.log(data);
})();
传递给的page函数缺少语句,因此不返回值。因此,变量
数据
为
有两个额外的细节需要注意:
Array.from(arrayLike, mapFn) // good
Array.from(arrayLike).map(mapFn) // bad
let data = ... // good
var data = ... // bad
'use strict';
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({
headless: false,
});
const page = await browser.newPage();
await page.authenticate({
username: 'username',
password: 'password',
});
await page.goto('https://website/.../all');
await page.waitFor(120000);
console.log('started evalating');
let data = await page.evaluate(() => {
return Array.from(
document.querySelectorAll('#data > div.data-wrapper > div > div > table > tbody tr'),
row => ({
site: row.querySelector('td:nth-child(2)').innerText,
pass: row.querySelector('td:nth-child(10)').innerText,
user: row.querySelector('td:nth-child(9)').innerText,
})
);
});
console.log(data);
})();