JD.com's real-time logistics is mainly achieved through the following aspects:

1. Powerful logistics system: JD.com has established a nationwide logistics network, including warehousing, transportation, distribution and other links, which provides a basis for real-time logistics tracking by optimizing logistics resource allocation and improving operational efficiency.

2. Information system: JD.com uses big data, cloud computing and other technologies to build a complete logistics information system. This system can collect, analyze and process information in the logistics process in real time to provide users with accurate logistics dynamics.

3. Logistics tracking technology: JD.com uses a series of Internet of Things technologies on express parcels, such as RFID, barcodes, etc., to accurately track logistics information. Through these technologies, users can understand the location and status of the parcel in real time.

4. Mobile Internet technology: JD.com's mobile client provides a real-time logistics query function, and users can view parcel information anytime and anywhere through their mobile phones. In addition, JD.com also cooperates with third-party logistics companies to realize cross-platform and cross-enterprise logistics information sharing, further improving the accuracy of real-time logistics queries.

5. Artificial Intelligence and Machine Learning: By using artificial intelligence and machine learning technologies, JD.com can predict consumer demand, optimize logistics routes, and improve delivery efficiency, thereby realizing real-time logistics services.

6. Continuous Optimization and Innovation: JD.com continuously optimizes and innovates its logistics system, information system, tracking technology, etc. to meet users' needs for real-time logistics.

In summary, the realization of JD.com's real-time logistics depends on a sound logistics system, advanced information technology, Internet of Things technology, mobile Internet technology, and continuous optimization and innovation. Through these means, JD.com provides users with a one-stop logistics solution and realizes real-time logistics tracking services.