我有一个问题,我也不知道为什么。任何帮助,将不胜感激。

我正在做我的小引擎,也许是为了一些小游戏。我目前为2个玩家设置了它,但我希望将来能够添加更多。我的问题是控件(箭头)仅适用于玩家1。我具有适用于玩家2的WSAD,但这不起作用。我尝试调试它,更改它等..无法解决问题。

这是按键记录代码:

//========== KEY LOGGING ==========
var pressedKeys = [];
//declare as globals coz of debug
var x;
var y;
var x2;
var y2;

function moveLeft(checkId, checkX, checkY, cSize, cSpeed, cKey) {
  if (x > 0) {
    playerList[checkId].x = checkX - cSpeed;
  } else {
    playerList[checkId].x = 0;
  }
}
function moveUp(checkId, checkX, checkY, cSize, cSpeed, cKey) {
  if (y > 0) {
    playerList[checkId].y = checkY - cSpeed;
  } else {
    playerList[checkId].y = 0;
  }
}
function moveRight(checkId, checkX, checkY, cSize, cSpeed, cKey) {
  if (x2 < width) {
    playerList[checkId].x = checkX + cSpeed;
  } else {
    playerList[checkId].x = width - cSize;
  }
}
function moveDown(checkId, checkX, checkY, cSize, cSpeed, cKey) {
  if (y2 < height) {
    playerList[checkId].y = checkY + cSpeed;
  } else {
    playerList[checkId].y = height - cSize;
  }
}
function Move(checkId, checkX, checkY, cSize, cSpeed, cKey) {
  x = checkX - cSpeed;
  y = checkY - cSpeed;
  x2 = checkX + cSize + cSpeed;
  y2 = checkY + cSize + cSpeed;
  //player 1
  if(checkId == 0) {
    switch (cKey) {
      case 37:
        // left
        moveLeft(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      case 38:
        // up
        moveUp(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      case 39:
        // right
        moveRight(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      case 40:
        // down
        moveDown(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      default:
        return; // exit this handler for other keys
    }
  }
  //player 2
  if(checkId == 1) {
    switch (cKey) {
      case 65:
        // left - A
        moveLeft(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      case 87:
        // up - W
        moveUp(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      case 68:
        // right - D
        moveRight(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      case 83:
        // down - S
        moveDown(checkId, checkX, checkY, cSize, cSpeed, cKey);
        break;
      default:
        return; // exit this handler for other keys
    }
  }
}

// == KEYDOWN ==
$(document.body).keydown(function (e) {
  e.preventDefault();
  //go through all players
  $.each(playerList, function (i, currentPlayer) {
    if (!pressedKeys[e.which]){
      //set interval for the function
      pressedKeys[e.which] = setInterval(function(){
        Move(currentPlayer.id, currentPlayer.x, currentPlayer.y, currentPlayer.size, currentPlayer.speed, e.which)
      }, 0);
    }
  });
  //+
  if (pressedKeys[107]) {
    currentPlayer.speed += 1; }
    // -
    if (pressedKeys[109] && currentPlayer.speed > 1) {
      currentPlayer.speed -= 1;
    }
    //addplayer
    if (pressedKeys[80]) {
      addPlayer("red", size, width / 2 + id * size, height / 2 + id * size);
    }
  });
  // == KEYUP ==
  $(document.body).keyup(function (e) {
    if (pressedKeys[e.which]){
      clearInterval(pressedKeys[e.which]);
      delete pressedKeys[e.which];
    }
  });

最佳答案

您的特定问题的答案就在这里:

$.each(playerList, function (i, currentPlayer) {
  if (!pressedKeys[e.which]){
    //set interval for the function
    pressedKeys[e.which] = setInterval(function() {
      Move(currentPlayer.id, currentPlayer.x, currentPlayer.y, currentPlayer.size, currentPlayer.speed, e.which);
    }, 0);
  }
});


假设w被推送。此代码从播放器1(currentPlayer.id为0)开始遍历播放器列表。假设pressedKeys最初为空。由于按下了w,因此将pressedKeys[87]设置为该新间隔的指针,该间隔每0毫秒运行一次Move

所以Move运行。但是,您可以在Move中进行检查:

if(checkId == 0) ...


由于“ w”仅对播放器2有效(checkId为1),因此什么也没有发生,并且Move返回。

然后,我们回到您的$.each。现在我们开始使用Player2。但是,我们达到了这一点:

if (!pressedKeys[e.which]) ...


但是pressedKeys[87]已经设置。什么也没发生,但是已经确定了。因此,程序跳过了这一步并继续前进。因此,玩家2的任何动作都不会起作用。

您可以执行以下操作:

添加具有对每个玩家有效的键的数组。在执行if (!pressedKeys[e.which])之前,请检查所按下的键是否有效:

if (validkeys[currentPlayer.id].indexOf(e.which) == -1) return true;

07-25 21:57