从基础开始深入学Flash AS3教程(5)(译文)

var i:Number;
var j:Number;
var exit:Boolean = false;
for (i=0; i<10; i++) {
    for (j=0; j<10; j++) {
        if (i > 3 && j > 3) {
            exit = true;
            break;
        }
    }
    if (exit) {
        break;
    }
}

在引入了新的标签以后，可以使用下面的方法从内循环体中直接break掉外循环体：

var i:Number;
var j:Number;
mainLoop: for (i=0; i<10; i++) {
    for (j=0; j<10; j++) {
        if (i > 3 && j > 3) {
            break mainLoop;
        }
    }
}

package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.ui.Mouse;
    
    public class Test extends Sprite {
        
        private var cursor:Sprite = new Sprite();
        
        public function Test() {
            cursor.graphics.beginFill(0xFF);
            cursor.graphics.drawRect(0, 0, 25, 25);
            addChild(cursor);
            
            stage.addEventListener(Event.MOUSE_LEAVE, cursorHide);
            stage.addEventListener(MouseEvent.MOUSE_MOVE, cursorFollow);
            Mouse.hide();
        }
        
        public function cursorHide(evt:Event):void {
            cursor.visible = false;
        }
        
        public function cursorFollow(evt:MouseEvent):void {
            if (!cursor.visible) cursor.visible = true;
            cursor.x = stage.mouseX;
            cursor.y = stage.mouseY;
            evt.updateAfterEvent();
        }
    }
}

当鼠标离开Movie的时候，鼠标指针将被隐藏。当鼠标再次移动到Movie上的时候，mouseMove会被执行，然后显示鼠标。