网页E-commerce China Dangdang Inc. (Chinese: 当当网), known as Dangdang, is a Chinese electronic commerce company, founded by Peggy Yu and Li Guoqing in 1999. [2] It is headquartered in Beijing and its main competitors are Amazon.cn (or Amazon China, formerly Joyo.com ) and JD.com (or Jingdong, formerly 360buy.com ).