https://i.imgur.com/NgxEqfM.png
上面JS 下面Unity内建的数学函式库 两边分开做类似FrameSync的同步计算
https://i.imgur.com/PWdeIbS.png
得到了不同结果 操他妈RoundToInt一定有加料 不是普通的四舍五入
结果去查Documents
If the number ends in .5 so it is halfway between two integers,
one of which is even and the other odd, the even number is returned.
为什么要这么做 谁看函式名称能想到会优先回传偶数啦干