关于parval

对parval()，属性指向很困扰
8 z4 \# m: [9 D' E( `% @8 y比如： baynumber = parval(2)，求注解下，为什么是（2），

8 B4 Y9 b# j9 Z如果levelnuber=?????  求注解。。。。
1 c, u5 ?7 s# o( O. S3 FFor developer use. This command is used inside a function that is called by the nodefunction() command. It returns the parameter passed to nodefunction specified by index as a number. The first additional parameter passed to nodefunction() is parameter 1, the second is parameter 2, etc. Parameters can also be retrieved using parnode() and parstr() for casting them as a treenode and string respectively.
3 N8 k5 l# R/ o# y* G9 mExample: double passedval = parval(3);

$ v- {1 L# k4 S; c8 CThis sets passedval equal to the number that was passed to nodefunction() as parameter 3.

函数解释很详细哦他应该就是个传递参数吧