Recursive remember to return

I have defined a method to find the method with the parent node Li of the current node, and then print the class name of this node.

At the beginning, I wrote the following methods:

Function getli (SRC ){
If (SRC. nodename = 'lil ')
Return SRC;
Else
Getli (SRC. parentnode );
}

Src = getli (SRC)

In this case, an error is returned.

Later I discovered that I did not return the recursive data in else.

After modification

Function getli (SRC ){
If (SRC. nodename = 'lil ')
Return SRC;
Else
Return getli (SRC. parentnode );
}

Src = getli (SRC)