I want to change the frame of the MovieClip by dragging the ball, but it's not working.

My screen width is 800.
In the onPressMove function, I first set the range of ball's movement on the X-axis between 20 and 780.
I want to change the frame of car to 0 when the ball's position is { top: 1, right: 20, bottom: 1, left: 685.5 }, and change it to 1 when the ball's position is { top: 1, right: 114.5, bottom: 1, left: 590.15 }.

My ball can move now, but car not change the frame when ball move to the specific region.

Could anyone tell me what's wrong?

car have a lot of frame inside.

var root = this;
var ball = root.ball;
var car = root.car;

function main()
{
	createjs.Touch.enable(stage);
	stage.mouseMoveOutside = true;
	
	root.stop();

    ball.hitFrame = 1;
    ball.missFrame = 0;
    //ball.dropArea = { top: 1, right: 20, bottom: 1, left:  20 };
    ball.stopCar0 = { top: 1, right: 20, bottom: 1, left:  685.5 };
    ball.stopCar1 = { top: 1, right: 114.5, bottom: 1, left:  590.15 };
    ball.stopCar2 = { top: 1, right: 209.85, bottom: 1, left:  495.35 };
    ball.on("mousedown", onMouseDown);
}

function onMouseDown(e)
{
	var target = e.currentTarget;
	
	target.offset = { x: stage.mouseX / stage.scaleX - target.x, y: stage.mouseY / stage.scaleY - target.y };
	target.pressMoveListener = ball.on("pressmove", onPressMove);
	target.pressUpListener = ball.on("pressup", onPressUp);
}

function onPressMove(e)
{
	var target = e.currentTarget;
	
	target.x = stage.mouseX / stage.scaleX - target.offset.x;

    if (target.x < 20) {
        target.x = 20;
    } else if (target.x > 780) {
        target.x = 780;
    }
    else if (target.x > ball.stopCar0.left && target.x < ball.stopCar0.right)
	{
		root.car.gotoAndStop(0);
    }
    else if (target.x > ball.stopCar1.left && target.x < ball.stopCar1.right)
	{
		root.car.gotoAndStop(1);
    }
    else if (target.x > ball.stopCar2.left && target.x < ball.stopCar2.right)
	{
		root.car.gotoAndStop(2);
    }
}

function onPressUp(e)
{
	var target = e.currentTarget;

	target.off("pressmove", target.pressMoveListener);
	target.off("pressup", target.pressUpListener);
}

if (!root.frame0Started)
{
	main();
	root.frame0Started = true;
}