5

我正在用javascript创建一个游戏,我的gameloop每30毫秒调用一次,它会泄漏大量内存,因为任务管理器显示firefox内存使用量在大约20秒内增加了400mb。我不熟悉如何确保在 javascript 中收集内存。

function GameLoop(tick) {
  move(player1.ship);
}

function Player(name) {
  this.id = 0;
  this.name = name;
  this.ship = Ship(this);
}

function Ship(player) {
  this.pos = [1024/2, 768/2];
  this.vel = [0, 0];
  this.angle = 0;
  this.acc = 0;
  this.thrust = 0;
  this.west = 0;
  this.east = 0;
  this.turnRate = 5;
  this.player = player;
  this.size = [40, 40];
  this.ship = canvas.rect(this.pos[0], this.pos[1], this.size[0], this.size[1]);
  this.ship.attr("fill", "red");

  return this;
}

function move(ship) {
  var angle = ship.angle;
  var max_speed = 20;
  var acc_speed = 300;

  var acc = 0;
  if (ship.thrust) {
    acc = 0.25 * acc_speed;
  }
  else { //slow down
    if ((acc - (0.25 * acc_speed)) > 0) {
      acc -= 0.25 * acc_speed;
    }

    else {
      acc = 0;
    }
  }

  var speedx = ship.vel[0] + acc * Math.sin(angle);
  var speedy = ship.vel[1] - acc * Math.cos(angle);
  var speed = Math.sqrt(Math.pow(speedx,2) + Math.pow(speedy,2));

  var speedx = ship.vel[0] + acc;
  var speedy = ship.vel[1] - acc;
  var speed = speedx + speedy;

  if (speed > max_speed) {
    speedx = speedx / speed * max_speed;
    speedy = speedy / speed * max_speed;
  }
  ship.vel = [speedx, speedy];
  ship.pos = [ship.pos[0] + speedx * 0.25, ship.pos[1] + speedy * 0.25];
  ship.ship.attr({x: ship.pos[0], y: ship.pos[1]});
  ship.ship.rotate(angle);
  ship.angle = 0;

  delete this.thrust;
  delete this.west;
  delete this.east;
  delete old_angle;
  delete angle;
  delete max_speed;
  delete acc_speed;
  delete acc;
  delete speedx;
  delete speedy;
  delete speed;

  return this;
}

var player1 = new Player("Player 1");
setInterval(GameLoop, 30);

好的,我注释掉了一些代码并找到了有问题的行,它

ship.ship.rotate(角度); 在注释掉那条线后,javascript 正在使用 4500K。知道为什么这会导致问题,如果没有这段代码,我怎么能旋转我的对象?

4

2 回答 2

3

RaphaelJS中的旋转文档说明如下:

将围绕给定点的给定角度的旋转添加到元素的变换列表中。

这听起来肯定是一个潜在的罪魁祸首。那里的关键词是addlist

当你旋转一个元素两次时,变换函数会显示什么?我怀疑旋转的调用会累积越来越大的转换字符串。如果发生这种情况,您可以重置转换,

el.transform("");

这应该可以解决您看到的问题。

于 2012-01-05T04:20:09.650 回答
2

我在您的代码片段中看不到任何会泄漏内存的内容。

正如 Eugen Rieck 所指出的,Firefox(和其他人)有时不会进行 GC 和/或释放他们分配的内存,直到他们真正有理由这样做。

您是否尝试过使用实际的内存分析工具来查看您的代码是否真的存在泄漏?我不确定 Firefox 是否有一个,但至少在 Chrome 中有一个。

于 2012-01-05T00:02:42.757 回答