> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-zh.cn/llms.txt
> Use this file to discover all available pages before exploring further.

# 回调集成

> 使用 LangChain JavaScript 进行回调集成。

<Columns cols={3}>
  <Card title="Datadog 追踪器" icon="link" href="/oss/javascript/integrations/callbacks/datadog_tracer" arrow="true" cta="查看指南" />

  <Card title="Upstash 速率限制" icon="link" href="/oss/javascript/integrations/callbacks/upstash_ratelimit_callback" arrow="true" cta="查看指南" />
</Columns>

***

<div className="source-links">
  <Callout icon="edit">
    [Edit this page on GitHub](https://github.com/langchain-ai/docs/edit/main/src/i18n\zh-CN\oss\javascript\integrations\callbacks\index.mdx) or [file an issue](https://github.com/langchain-ai/docs/issues/new/choose).
  </Callout>

  <Callout icon="terminal-2">
    [Connect these docs](/use-these-docs) to Claude, VSCode, and more via MCP for real-time answers.
  </Callout>
</div>