synchronous and async in js

Question

Is it possible to have a program that is only asynchronous? What problems will occur with such a program?

伊谢尔伦 · Answer

Only async? No way
Synchronization and asynchronous itself are used to distinguish the execution dependencies of the program. They are executed after the previous execution is completed or do not pay attention to the execution results of the previous program. But in the final analysis, sequence or synchronization must exist

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