我碰上这种偶尔总是忘记怎么做了。

其中的一个东西，弹出以往任何时候都频繁。

此外，有什么公式转换角度的前pressed弧度为度，然后再返回？

 弧度=度*（PI / 180）

度=弧度*（180 / PI）
 

至于实施，主要的问题是如何precise你想对圆周率的值。这里有一些相关的讨论

I run into this occasionally and always forget how to do it.

One of those things that pop up ever so often.

Also, what's the formula to convert angles expressed in radians to degrees and back again?

radians = degrees * (pi/180)

degrees = radians * (180/pi)

As for implementation, the main question is how precise you want to be about the value of pi. There is some related discussion here