All books are ordered directly from the publishing house, and the quality is similar. The delivery speed in JD.COM is a little faster, and the after-sales service is self-service. Dangdang has more books and more activities than JD.COM. There will be many books cheaper at the end of Dangdang. If you want to buy something online, you can buy it through Tingting. At least you will get cash back to your parents, so that you can save more money.