爬取基恩士网站主页上的产品图，以下是一个简单的示例，注意要先创建对应的目录。
package main
import (
"fmt"
"github.com/gocolly/colly"
"io"
"net/http"
"os"
)
// global variables
var destUrl string
/**
download images
*/
func downloadImages(_ int, e *colly.HTMLElement) {
srcRef := e.Attr("src")
fullurl := destUrl + srcRef
res, _ := http.Get(fullurl)
savedPath := "D:" + srcRef
// TODO create dirs before create file
f, err := os.Create(savedPath)
if(err != nil) {
panic(err)
}
io.Copy(f, res.Body)
fmt.Println(destUrl + srcRef)
}
func main() {
c := colly.NewCollector()
c.OnHTML("ul[class]", func(e *colly.HTMLElement) {
className := e.Attr("class")
if (className == "ProductsList full") {
e.ForEach("img[src]", downloadImages)
}
})
c.OnRequest(func(r *colly.Request) {
fmt.Println("Visiting", r.URL)
})
destUrl = "https://www.keyence.com.cn"
c.Visit(destUrl)
}
