ASCB阅读笔记一、ActionScript Basics

1，使用trace来debug程序

package {
    import flash.display.Sprite;
    
    public class ExampleApplication extends Sprite {
        public function ExampleApplication() {
            var userName:String = "Bill Smith";
            trace("My name is " + userName + ".");
        }
    }
}

2，使用addEventListener来处理事件

package {
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    
    public class ExampleApplication extends Sprite {
        private var _sprite:Sprite;
        public function ExampleApplication() {
            _sprite = new Sprite();
            addChild(_sprite);
            _sprite.graphics.beginFill(0xffffff);
            _sprite.graphics.drawRect(0, 0, 400, 400);
            _sprite.graphics.endFill();
            _sprite.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
            _sprite.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
        }
        private function onMouseDown(event:MouseEvent):void {
            _sprite.graphics.lineStyle(1, 0, 1);
            _sprite.graphics.moveTo(mouseX, mouseY);
            _sprite.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
        }
        private function onMouseUp(event:MouseEvent):void
        {
            _sprite.removeEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
        }
        private function onMouseMove(event:MouseEvent):void {
            _sprite.graphics.lineTo(mouseX, mouseY);
        }
    }
}

3，实例方法和类方法

package {
    import flash.display.Sprite;

    public class ExampleApplication extends Sprite
    {
        public function ExampleApplication() {
            for(var i:int=0;i<10;i++) {
                drawLine();
            }
        }
        private function drawLine():void {
            graphics.lineStyle(1, Math.random() * 0xffffff, 1);
            graphics.moveTo(Math.random() * 400, Math.random() * 400);
            graphics.lineTo(Math.random() * 400, Math.random() * 400);
        }
    }
}

public static function showMessage():void {
    trace("Hello world");
}

ExampleApplication.showMessage();

4，数据类型、循环、条件判断、异常处理等都类似于JavaScript，package、import、类继承、对象、方法都类似于Java