Question

函数没有过程体是什么意思。

package
{
import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import flash.events.Event;

public class main_snake extends MovieClip
{
var sx:int;
var sy:int;
public function main_snake();
{
init();
}
function init():void;
{
sx = 0;
sy = 0;
stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
function onKeyDown(event:KeyboardEvent):void
{
if (event.keyCode == Keyboard.LEFT)
{
sx = -5;
}
else if (event.keyCode == Keyboard.RIGHT)
{
sx = 5;
}
else if (event.keyCode == Keyboard.UP)
{
sy = -5;
}
else if (event.keyCode == Keyboard.DOWN)
{
sy = 5;
}
}
function onKeyUp(event:KeyboardEvent):void
{
if (event.keyCode == Keyboard.LEFT || event.keyCode == Keyboard.RIGHT)
{
vx = 0;
}
else if (event.keyCode == Keyboard.DOWN || event.keyCode == Keyboard.UP)
{
vy = 0;
}
}
function onEnterFrame(event:Event):void
{
snake.x += sx;
snake.y += sy;
}
}
}

Answer 1

程序出错了，缺乏内部的过程体！

Answer 2

8

Answer 3

大括号前面封号去掉