canvas闪烁的星光粒子动画特效

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if (this.alive) {
      var force = G(this.forceBetween(field, distance));
      totalAccelerationX += vectorX * G(force);
      totalAccelerationY += vectorY * G(force);
    }
  }

  var travelDist = this.pos.distance(this.lastPos ? this.lastPos : this.pos);
  this.velocity = travelDist - (this.lastDistance ? this.lastDistance : travelDist);
  this.lastDistance = travelDist;
  this.lastPos = this.pos.clone();