1. Open the JD.COM website and log in to your account.

2. Find the goods you want to buy, and then find the details page of the goods.

3. On the product details page, find the column of "Price Trend" and click Enter.

4. On the price trend page, you can see the commodity price trend in the past 30 days. If you need to see the price trend for a longer time, you can click the "Historical Price" button below the price trend.

5. On the historical price page, you can choose to view the price trends in different time periods, including 7 days, 30 days, 60 days, 180 days and one year. Click on the corresponding time period to view the price trend of goods during this time period.

6. On the historical price page, you can also filter out unnecessary price trend information through the filter conditions on the left. For example, you can choose to view only self-operated goods or only special offers and so on.