This kind of asynchronousflow is one of the most common pitfalls of Ajax programming.
这种异步流是Ajax编程最常见的缺陷之一。
2
Asynchronous programming can sometimes be a hassle and I understand if developers sometimes omit the callback references just to keep the control flow more straight-forward.
异步编程有时候非常麻烦，我明白开发人员有时候忽略回调引用，是否只是想让控制流能更加直截了当一些。
3
This would typically be where we need the flow to wait for an asynchronous event to occur (which takes a fixed period of time).