China’s e-commerce giants Alibaba Group Holding and JD.com reported record-breaking sales for the Singles’ Day online shopping festival, as the companies looked to artificial intelligence to help boost sales and traffic amid a sluggish economy. During the event, which ran for almost a month from mid-October, Alibaba’s online retail platforms Taobao and Tmall saw more than 34,000 brands double their sales from a year ago, the company said on Saturday. More than 18,000 brands recorded sales growth...