关于parval

对parval()，属性指向很困扰
. D$ j+ K9 o0 h+ I! p6 Q- J5 e比如： baynumber = parval(2)，求注解下，为什么是（2），

3 q' Z/ b1 R- S9 b! l" I) }8 x如果levelnuber=?????  求注解。。。。
* V) N$ |$ w$ i! c6 \1 e4 O  ]5 rFor 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.
) R3 Z! u$ ~7 \; m) F2 u# i( p# eExample: double passedval = parval(3);

" n0 ~1 k" m2 Z1 E# eThis 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