1. JD.com's monthly sales are calculated based on the actual sales volume of each product in a month.

2. JD.com's sales calculation is based on data statistics from the order system. Each order contains the number of purchased products and the time information of the order. By counting all orders for each product in a month and accumulating the purchase quantity of the product, the monthly sales volume of the product can be obtained.

3. JD.com's monthly sales calculation also takes into account some other factors, such as returns and exchanges, to ensure the accuracy and reliability of the data. In addition, JD.com will rank and recommend products based on their sales to provide a better shopping experience and service. JD.com's monthly sales are one of the important indicators for merchants and consumers to evaluate the sales of products. For merchants, monthly sales can reflect the popularity and market demand of products, which helps to formulate sales strategies and replenishment plans. For consumers, monthly sales can be used as a reference indicator to help them choose hot-selling and high-quality products. Therefore, JD.com's monthly sales calculation is of great significance to both merchants and consumers.