Golang 网络爬虫框架 gocolly

package main
import (  "fmt"  colly "github.com/gocolly/colly/v2"  "github.com/gocolly/colly/v2/debug")
func main() {  mUrl := "http://www.ifeng.com/"  //colly的主体是Collector对象，管理网络通信和负责在作业运行时执行附加的回掉函数  c := colly.NewCollector(    // 开启本机debug    colly.Debugger(&debug.LogDebugger{}),  )  //发送请求之前的执行函数  c.OnRequest(func(r *colly.Request) {    fmt.Println("这里是发送之前执行的函数")  })  //发送请求错误被回调  c.OnError(func(_ *colly.Response, err error) {    fmt.Print(err)  })
  //响应请求之后被回调  c.OnResponse(func(r *colly.Response) {    fmt.Println("Response body length：", len(r.Body))  })  //response之后会调用该函数，分析页面数据  c.OnHTML("div#newsList h1 a", func(e *colly.HTMLElement) {    fmt.Println(e.Text)  })  //在OnHTML之后被调用  c.OnScraped(func(r *colly.Response) {    fmt.Println("Finished", r.Request.URL)  })  //这里是执行访问url  c.Visit(mUrl)}

这里是发送之前执行的函数[000001] 1 [     1 - request] map["url":"http://www.ifeng.com/"] (0s)[000002] 1 [     1 - responseHeaders] map["status":"OK" "url":"http://www.ifeng.com/"] (64.9485ms)Response body length：250326习近平在基层代表座谈会上讲话|全文Finished http://www.ifeng.com/[000003] 1 [     1 - response] map["status":"OK" "url":"http://www.ifeng.com/"] (114.9949ms)[000004] 1 [     1 - html] map["selector":"div#newsList h1 a" "url":"http://www.ifeng.com/"] (118.9926ms)[000005] 1 [     1 - html] map["selector":"div#newsList h1 a" "url":"http://www.ifeng.com/"] (118.9926ms)[000006] 1 [     1 - scraped] map["url":"http://www.ifeng.com/"] (118.9926ms)