《Flash拖拽》通用解决代码

var target_array = [a_mc, b_mc, c_mc];
var to_where_obj = {};
var initial_position_obj = {};
 
var destination_array = [x1_mc, x2_mc, x3_mc];
var is_occupied_obj = {};
 
for (var i = 0; i < target_array.length; i++) {
    var _mc = target_array[i];
    initial_position_obj[_mc._name] = {_x:_mc._x, _y:_mc._y};
   
    _mc.onPress = function()
    {
        delete is_occupied_obj[to_where_obj[this._name]];
        delete to_where_obj[this._name];
        this.startDrag();
        this.onMouseMove = function()
        {
            updateAfterEvent();
        };
    };
    _mc.onRelease = _mc.onReleaseOutside = function ()
    {
        var is_hit;
        for (var i = 0; i < destination_array.length; i++) {
            var _mc = destination_array[i];
            if (!is_occupied_obj[_mc._name] && this.hitTest(_mc)) {
                is_occupied_obj[_mc._name] = this;
                to_where_obj[this._name] = _mc._name;
                this._x = _mc._x;
                this._y = _mc._y;
                is_hit = true;
            }
        }
        if (!is_hit) {
            this._x = initial_position_obj[this._name]._x;
            this._y = initial_position_obj[this._name]._y;
        }
        stopDrag();
        delete this.onMouseMove;
       
    };
}
// ActionScript 3.0 :

var target_array:Array = [a_mc, b_mc, c_mc];
var to_where_obj:Object = new Object();
var initial_position_obj:Object = new Object();
 
var destination_array:Array = [x1_mc, x2_mc, x3_mc];
var is_occupied_obj:Object = new Object();
 
for (var i:Number = 0; i < target_array.length; i++) {
    var _mc = target_array[i];
    initial_position_obj[_mc.name] = {x:_mc.x, y:_mc.y};
    _mc.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);
    _mc.addEventListener(MouseEvent.MOUSE_UP, mouseReleased);
    _mc.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
}
function mouseDown(event:MouseEvent):void
{
    var _mc = event.target;
    delete is_occupied_obj[to_where_obj[_mc.name]];
    delete to_where_obj[_mc.name];
    _mc.startDrag();
}
function mouseReleased(event:MouseEvent):void
{
    var is_hit:Boolean = false;
    var des_mc:MovieClip = new MovieClip();
    var tar_mc = event.target;
    tar_mc.stopDrag();
    for (var i:Number = 0; i < destination_array.length; i++) {
        des_mc = destination_array[i];
        if (!is_occupied_obj[des_mc.name] && tar_mc.hitTestObject(des_mc)) {
            is_occupied_obj[des_mc.name] = tar_mc;
            to_where_obj[tar_mc.name] = des_mc.name;
            tar_mc.x = des_mc.x;
            tar_mc.y = des_mc.y;
            is_hit = true;
        }
    }
    if (!is_hit) {
        tar_mc.x = initial_position_obj[tar_mc.name].x;
        tar_mc.y = initial_position_obj[tar_mc.name].y;
    }
}
function mouseMoveHandler(event:MouseEvent):void
{
    event.updateAfterEvent();
}