淘宝搜索页面这个如何获取

https://s.taobao.com/search?_input_charset=utf-8&commend=all&ie=utf8&initiative_id=tbindexz_20170306&page=1&preLoadOrigin=https%3A%2F%2Fwww.taobao.com&q=%E7%83%A7%E7%83%A4%E7%82%89%E5%AD%90&search_type=item&source=suggest&sourceId=tb.index&spm=a21bo.jianhua%2Fa.search_guessRecommend.d4&ssid=s5-e&suggest_query=&tab=all&wq=

这个页面想获取到data.itemsArray[0].umpPriceLog.umpLog的值如何弄呢，主要遇到问题是转换json数据失败，获取不到内容