This set of video tutorials is from the shallower to the deeper and is easy to understand. It dismantles the complex implementation step by step, uses a breakthrough design, and explains it step by step, making it more interesting to learn. The course content covers the practice of front-end and back-end asynchronous programming tasks, allowing you to understand Promise at a macro level. Five major parts of the course: 1. Introduction and basic use 2.Promise API 3. Several key issues in Promise 4. Customized packaging 5.async and await (the ultimate solution to asynchronous programming)