Shijiazhuang books create business limited liability company. The original Dangdang book collection upgraded to Ding Ding book collection, Ding Ding book collection small program is Shijiazhuang books to create business limited liability company. Ding Ding collect books is a small program that can scan the code or enter the ISBN to buy books, scanning the code books to reach 10, and the amount reaches 20 yuan can be submitted to sell the book order.