why doesn't (if) work with no mistakes in code - actionscript-3

Question

my code is with AS3 ,( if-else) when i run it doesn't give me a mistake,but also doesn't give me the result of (if) that i want.
the ( tom) object has to be unvisible if touched another object called (food )else (tom) go back to ot's place
the idea is with ( drag and drop )
var hits = 0;
tom.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
tom.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
function mouseDownHandler(evt:MouseEvent):void {
var object = evt.target;
// we should limit dragging to the area inside the canvas
object.startDrag();
}
function mouseUpHandler(evt:MouseEvent):void {
var obj = evt.target;
var target = obj.dropTarget;
if (target == food && obj == tom) {
obj.visible=false;
} else {
obj.x=1051.05;
obj.y=135.05;
obj.stopDrag();
}
}

Answer 1

"When I run it doesn't give me a mistake, but also doesn't give me the result of if that I want."
That's because there is no error. You don't get a result because your IF condition is never reached. Think about example: if (obj == tom) Here what would ever make var obj be equal to var tom?
Solution:
I suspect food and tom are names, right? Try code to check by instance name...
function mouseUpHandler (evt:MouseEvent) :void
{
var obj = evt.target;
var target = obj.dropTarget;
if (target.name == "food" && obj.name == "tom")
{
obj.visible = false;
}
else
{
obj.x = 1051.05;
obj.y = 135.05;
obj.stopDrag();
}
}