spigo | Simulate Protocol Interactions in Go

"I drag thebugboss to the stage, then I name it bugboss. I use this : bossArray.push(bugboss);. And the bosshientai is like this"

Don't drag the boss to stage. Add it by code. Your code like bugboss.x appears to work because it is talking to the stage object with instance name bugboss. removeChild expects a variable not a dragged item.

"The supplied DisplayObject must be a child of the caller" The error happens because your shown code did not add it (you dragged), so now code cannot remove something that itself did not add.

Assuming linkage name is thebugboss:

1) Create new instance (ie: a new copy) of the thebugboss class: