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CHSHJ 发表于 2018-9-21 08:26:28

Go Playground exercise

package main　　

　　
import (
　　
   "fmt"
　　
   "sync"
　　
)
　　

　　
type Fetcher interface {
　　
   // Fetch returns the body of URL and
　　
   // a slice of URLs found on that page.
　　
   Fetch(url string) (body string, urls []string, err error)
　　
}
　　

　　
// Crawl uses fetcher to recursively crawl
　　
// pages starting with url, to a maximum of depth.
　　
func Crawl(url string, depth int, fetcher Fetcher, c *urlSync, wg *sync.WaitGroup) {
　　
   // TODO: Fetch URLs in parallel.
　　
   // TODO: Don't fetch the same URL twice.
　　
   // This implementation doesn't do either:
　　
   defer wg.Done()
　　
   if depth

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