ASCB阅读笔记一、ActionScript Basics

最新推荐文章于 2024-08-30 14:12:24 发布

最新推荐文章于 2024-08-30 14:12:24 发布 · 121 阅读

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#ActionScript #Flash #JavaScript #UP #ViewUI

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本文通过三个示例介绍了如何使用ActionScript 3.0 (AS3.0) 进行Flash编程：利用trace进行调试；使用addEventListener处理鼠标事件绘制线条；以及展示实例方法与类方法的区别。这些示例涵盖了基本的AS3.0语法，包括数据类型、循环、条件判断、异常处理等。

1，使用trace来debug程序
[code]
package {
import flash.display.Sprite;

public class ExampleApplication extends Sprite {
public function ExampleApplication() {
var userName:String = "Bill Smith";
trace("My name is " + userName + ".");
}
}
}
[/code]

2，使用addEventListener来处理事件
[code]
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);
}
}
}
[/code]

3，实例方法和类方法
[code]
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();
[/code]

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