关于parval

对parval()，属性指向很困扰
: ]1 B: m# f/ U. j$ n, I1 q5 g比如： baynumber = parval(2)，求注解下，为什么是（2），

5 E; @% I8 D9 N$ L# z% i- N如果levelnuber=?????  求注解。。。。
For 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.
6 \; X3 l7 j. `Example: double passedval = parval(3);

# w6 S. Q% C: q* s3 VThis 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