Question

var ExplodeFrame = 0;
var ExplodeTimeout;

当玩家击中熔岩时，所有这一部分都会检查。有用。请参阅注释部分以调用动画

if((Player.x  > Lavas[i].x && Player.x  < (Lavas[i].x + Lavas[i].width)) || (Player.x + Player.width  > Lavas[i].x && Player.x + Player.width < (Lavas[i].x + Lavas[i].width)))
  {
    if((Player.y   > Lavas[i].y && Player.y < Lavas[i].y + Lavas[i].height) || (Player.y + Player.height > Lavas[i].y && Player.y + Player.height < Lavas[i].y + Lavas[i].height))
    {
     ExplodeTimeout = setTimeout(DrawSpawnAnimation, 200); //this part is new and might not work
     Player.jumping = false;
     Player.velY = 0;
     Player.velX = 0;
     Player.x = Player.spawnX;

     Player.y = Player.spawnY;
     Player.playerColour = Player.colour;

    }
  }


}

这种方法对我来说似乎不起作用？

function DrawSpawnAnimation()
{

ExplodeFrame++;
alert("current frame" + ExplodeFrame);
var explodeX = Player.x - 50;
var explodeY = Player.y - 50;

if(ExplodeFrame == 1)
{
ctxAnimation.drawImage(spriteSheet,0,2740,100,100,explodeX,explodeY,100,100);
}
else if(ExplodeFrame == 2)
{
ctxAnimation.drawImage(spriteSheet,100,2740,100,100,explodeX,explodeY,100,100);
}
else if(ExplodeFrame == 3)
{
ctxAnimation.drawImage(spriteSheet,200,2740,100,100,explodeX,explodeY,100,100);
}
else if(ExplodeFrame == 4)
{
ctxAnimation.drawImage(spriteSheet,300,2740,100,100,explodeX,explodeY,100,100);
}
else if(ExplodeFrame == 5)
{
ctxAnimation.drawImage(spriteSheet,400,2740,100,100,explodeX,explodeY,100,100);
}
else
{
ExplodeFrame = 0;
 clearTimeout(ExplodeTimeout);
  ctxAnimation.clearRect(0,0,canvasWidth,canvasHeight);
}

}

它应该以每秒5帧的速度显示动画，直到结束。这就是我想要做的。

Answer 1

setTimeout仅触发一次函数：

http://www.w3schools.com/jsref/met_win_settimeout.asp

听起来你正在寻找的是setInterval：

http://www.w3schools.com/jsref/met_win_setinterval.asp

Answer 2

setTimeout运行您的代码一次。看来你正在寻找每200毫秒运行一次的东西。为此，请使用setInterval。它的工作方式与您尝试使用setTimeout的方式相同。当您使用setInterval时，请通过调用clearInterval

清除它

Answer 3

首先，用

替换if语句

ctxAnimation.drawImage(spriteSheet,(ExplodeFrame - 1) * 100,2740,100,100,explodeX,explodeY,100,100);

其次，您只需调用DrawSpawnAnimation方法一次。为了实际看到动画，你应该反复调用它。通过在DrawSpawnAnimation：

结束时添加设置另一个超时来做到这一点

function DrawSpawnAnimation()
{
    ...
    if (ExplodeFrame < 5)
    {
         setTimeout(DrawSpawnAnimation, 20);
    }
}

似乎无法让setTimeout工作？

3 个答案: