bighardperson/computer-science-skills-collection/crawl4ai-skill

Crawl4AI Skill - Web Crawler & Scraper

Web Crawling 网页爬虫 | Web Scraping 网页爬取 | LLM 优化输出

智能网页爬虫和爬取工具，支持搜索、全站爬取、动态页面抓取。Free web crawler and scraper with LLM-optimized Markdown output.

核心功能 | Core Features

• 🔍 Web Search 网页搜索 - DuckDuckGo search, 免 API key
• 🕷️ Web Crawling 网页爬虫 - Site crawler, spider, sitemap 识别
• 📝 Web Scraping 网页抓取 - Smart scraper, data extraction
• 📄 LLM-Optimized Output - Fit Markdown, 省 Token 80%
• ⚡ Dynamic Page Scraping - JavaScript 渲染页面爬取

快速开始 | Quick Start

安装 | Installation

pip install crawl4ai-skill

Web Search | 网页搜索

# Search the web with DuckDuckGo
crawl4ai-skill search "python web scraping"

Web Scraping | 单页爬取

# Scrape a single web page
crawl4ai-skill crawl https://example.com

Web Crawling | 全站爬虫

# Crawl entire website / spider
crawl4ai-skill crawl-site https://docs.python.org --max-pages 50

使用场景 | Use Cases

场景 1：Web Crawler for Documentation | 文档站爬虫

# Crawl documentation site with spider
crawl4ai-skill crawl-site https://docs.fastapi.com --max-pages 100

爬虫效果 | Crawler Output:

• ❌ 移除：导航栏、侧边栏、广告
• ✅ 保留：标题、正文、代码块
• 📊 Token：50,000 → 10,000（-80%）

场景 2：Search + Scrape | 搜索+爬取

# Search and scrape top results
crawl4ai-skill search-and-crawl "Vue 3 best practices" --crawl-top 3

场景 3：Dynamic Page Scraping | 动态页面抓取

JavaScript 渲染的页面爬取（雪球、知乎等）：

# Scrape JavaScript-heavy pages
crawl4ai-skill crawl https://xueqiu.com/S/BIDU --wait-until networkidle --delay 2

命令参考 | Commands

常用参数 | Common Options

# Web Search 搜索
--num-results 10          # Number of results
 
# Web Scraping 爬取
--format fit_markdown     # Output format
--output result.md        # Output file
--wait-until networkidle  # Wait strategy for dynamic pages
--delay 2                 # Additional wait time (seconds)
--wait-for ".selector"    # Wait for specific element
 
# Web Crawling 爬虫
--max-pages 100          # Max pages to crawl
--max-depth 3            # Max crawl depth

输出格式 | Output Formats

fit_markdown（推荐 Recommended）

智能提取，节省 80% Token。Smart extraction, save 80% tokens.

crawl4ai-skill crawl https://example.com --format fit_markdown

raw_markdown

保留完整结构。Preserve full structure.

crawl4ai-skill crawl https://example.com --format raw_markdown

为什么选择这个爬虫？| Why This Crawler?

✅ 免费爬虫 Free Crawler - 无需 API key，开箱即用 ✅ 智能爬取 Smart Scraper - 自动去噪，提取核心内容 ✅ 全站爬虫 Site Crawler - 支持 sitemap，递归爬取 ✅ 动态爬取 Dynamic Scraping - JavaScript 渲染页面支持 ✅ 搜索集成 Search Integration - DuckDuckGo 搜索内置

链接 | Links

• 📦 PyPI
• 💻 GitHub
• 🦞 ClawHub