Cheerio 集成

# export LANGSMITH_TRACING="true"
# export LANGSMITH_API_KEY="your-api-key"

import { CheerioWebBaseLoader } from "@langchain/community/document_loaders/web/cheerio"

const loader = new CheerioWebBaseLoader("https://news.ycombinator.com/item?id=34817881", {
  // 可选参数：...
})

const docs = await loader.load()
docs[0]

Document {
  pageContent: '\n' +
    '        \n' +
    '                  Hacker News\n' +
    '                            new | past | comments | ask | show | jobs | submit            \n' +
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    '            What Lights the Universe’s Standard Candles? (quantamagazine.org)\n' +
    '          75 points by Amorymeltzer on Feb 17, 2023  | hide | past | favorite | 6 comments        \n' +
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    '          delta_p_delta_x on Feb 17, 2023           \n' +
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    "                  Astrophysical and cosmological simulations are often insightful. They're also very cross-disciplinary; besides the obvious astrophysics, there's networking and sysadmin, parallel computing and algorithm theory (so that the simulation programs are actually fast but still accurate), systems design, and even a bit of graphic design for the visualisations.Some of my favourite simulation projects:- IllustrisTNG: https://www.tng-project.org/- SWIFT: https://swift.dur.ac.uk/- CO5BOLD: https://www.astro.uu.se/~bf/co5bold_main.html (which produced these animations of a red-giant star: https://www.astro.uu.se/~bf/movie/AGBmovie.html)- AbacusSummit: https://abacussummit.readthedocs.io/en/latest/And I can add the simulations in the article, too.\n" +
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    '          froeb on Feb 18, 2023           \n' +
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    "                  Supernova simulations are especially interesting too. I have heard them described as the only time in physics when all 4 of the fundamental forces are important. The explosion can be quite finicky too. If I remember right, you can't get supernova to explode properly in 1D simulations, only in higher dimensions. This was a mystery until the realization that turbulence is necessary for supernova to trigger--there is no turbulent flow in 1D.\n" +
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    '          andrewflnr on Feb 17, 2023           \n' +
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    "                  Whoa. I didn't know the accretion theory of Ia supernovae was dead, much less that it had been since 2011.\n" +
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    '          andreareina on Feb 17, 2023           \n' +
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    '                  This seems  to be the paper https://academic.oup.com/mnras/article/517/4/5260/6779709\n' +
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    '          andreareina on Feb 17, 2023           \n' +
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    "                  Wouldn't double detonation show up as variance in the brightness?\n" +
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    '          yencabulator on Feb 18, 2023           \n' +
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    '                  Or widening of the peak. If one type Ia supernova goes 1,2,3,2,1, the sum of two could go    1+0=1\n' +
    '    2+1=3\n' +
    '    3+2=5\n' +
    '    2+3=5\n' +
    '    1+2=3\n' +
    '    0+1=1\n' +
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  metadata: { source: 'https://news.ycombinator.com/item?id=34817881' },
  id: undefined
}

console.log(docs[0].metadata)

{ source: 'https://news.ycombinator.com/item?id=34817881' }

import { CheerioWebBaseLoader } from "@langchain/community/document_loaders/web/cheerio"

const loaderWithSelector = new CheerioWebBaseLoader("https://news.ycombinator.com/item?id=34817881", {
  selector: "p",
});

const docsWithSelector = await loaderWithSelector.load();
docsWithSelector[0].pageContent;

Some of my favourite simulation projects:- IllustrisTNG: https://www.tng-project.org/- SWIFT: https://swift.dur.ac.uk/- CO5BOLD: https://www.astro.uu.se/~bf/co5bold_main.html (which produced these animations of a red-giant star: https://www.astro.uu.se/~bf/movie/AGBmovie.html)- AbacusSummit: https://abacussummit.readthedocs.io/en/latest/And I can add the simulations in the article, too.