如何用 colly 抓取属性中的属性

Question

我尝试抓取产品的 productId，但我做不到。请帮忙

html代码

<span class="info">
 <button data-product="{"merchantName":"xxx","price":"11","productName":"car window","categoryName":"windows","brandName":"aa assosiations","productId":"which I want to scrape"}">

当我尝试时

h.ChildAttr("span.info>button", "data-product")

结果是 {"merchantName":"xxx","price":"11","productName":"car window","categoryName":"windows","brandName":"aa assosiations","productId":"which I want to scrape"}

当我尝试时

h.ChildAttr("span.info>button", "productId")

没有结果。我如何使用 colly 获取这些数据？

Answer 1

属性值是一个原始值，在本例中，它是 JSON 格式，因此您需要解析 JSON 才能正确获取数据。

例如：

package main

import (
    "log"
    "encoding/json"
    "github.com/gocolly/colly"
)

func main() {
    c := colly.NewCollector()

    c.OnHTML(`body`, func(e *colly.HTMLElement) {
        text := e.ChildAttr("span.info>button", "data-product")

        var result map[string]interface{}
        err := json.Unmarshal([]byte(text), &result)
        if err != nil {
            log.Println(err)
            return
        }
        log.Println(result["productId"])
    })

    c.Visit("[some url]")
}

输出

2021/10/21 14:23:24 which I want to scrape

如何用 colly 抓取属性中的属性

how to scrape attribute in attibute with colly

html

go

web-scraping

html-parsing

go-colly