gocolly怎么获取img标签中的src啊？

gocolly定位到img标签了，但是获取不到src的内容，试过很多方法例如childattr，text等均获取不到，请问这里有什么办法吗

e.ForEach("div.image-container.image-float-center>div.image-wrapper", func(i int, element *colly.HTMLElement) {
            //fmt.Println(element.ChildAttr("div.image-wrapper>img.dou-preview-image.dou-preview-image-zoom-in","src"))
            img = img + element.ChildAttr("img.dou-preview-image.dou-preview-image-zoom-in","src")
            img += ",\n"
            fmt.Println(img)
        })