When I was in the crawl a web site source code like this:

In simple terms, is to pull down the scroll bar to a certain height, it will come out some content, I had to crawl,

Url is found by caught analysis,
https://search.jd.com/s_new.php? Keyword=proprietary book & amp; Enc=utf-8 & amp; QRST=1 & amp; Rt=1 & amp; Stop=1 & amp; N=2 & amp; Wq=proprietary book & amp; Page=2 & amp; S=31 & amp; Scrolling=y& Log_id=1577972759.11244 & amp; The TPL=2 _m & amp; Show_items=12413061124416 5124402 3124785 0124403 7123953 3126096 8119024 8122965 0120037 7125827 7123886 8117720 4127974 4121533 7126740 2126141 2126477 6127535 2117126 7108479 5125798 6124901 7123183 5126027 0125068 4121268 5123391 5124118 1122476 8
Now I want to get show_items content, how to do?