同时按键导致不必要的行为

Question

我正在使用动作脚本 3 制作射击游戏。我有一个英雄，当按下任何箭头键时都会移动 我的代码如下

//some class level variables
private var vx :int = 0;
private var vy :int = 0;

//in the Main constructor
stage.addEventListener(KeyboardEvent.KEY_DOWN , moveHero);
stage.addEventListener(KeyboardEvent.KEY_UP , stopHero);
stage.addEventListener(Event.ENTER_FRAME , onEnter);

//and all the handlers
function moveHero(e:KeyboardEvent)
{
    if (e.keyCode == 37)
    {
        vx = -5;
    } 
    else if (e.keyCode == 38)
    {
        vy = -10;
    } 
    else if (e.keyCode == 39)
    {
        vx = 5;
    } 
    else if (e.keyCode == 40)
    {
        vy = 10;
    }
}
function stopHero(e:KeyboardEvent)
{
    //when key is up stop miving the hero
    vx = 0;
    vy = 0;
}
function onEnter(e:Event):void
{
    //updtae hero position 
    hero.x += vx;
    hero.y += vy;
}

现在我的问题是，当用户在他的手指下同时有上下键或左右键并突然交替按下它们时，英雄在对按键的响应方面表现出明显的滞后

Answer 1

您必须完全按照 cmets 中所说的 BotMaster 进行操作，下面是它在 AS3 代码中的样子：

var keys:Array = new Array(255);

stage.addEventListener(KeyboardEvent.KEY_DOWN , keyDown);
stage.addEventListener(KeyboardEvent.KEY_UP , keyUp);
stage.addEventListener(Event.ENTER_FRAME , loop);

function keyDown(e:KeyboardEvent):void {
    keys[e.keyCode] = true;
}

function keyUp(e:KeyboardEvent):void {
    keys[e.keyCode] = false;
}

function loop(e:Event):void {
    if(keys[Keyboard.LEFT]) {
        trace("Moving left...");
    } else if(keys[Keyboard.RIGHT]) {
        trace("Moving right...");
    }
}