getProperty() property parameter value (undefined) is not a string.ERROR:

Question

请帮我解决游戏中的碰撞问题，这里有一个问题。它一直告诉我对象未定义。还说 Cannot get 属性 "undefined" on element "cdoor1" and for "char" too.

CollisionDetector("cdoor1" , true);
CollisionDetector("char" , true);

function CollisionDetector(object, isDoor){

  var playerX = getXPosition("char");
  var playerY = getYPosition("char");
  var objectX = getProperty(object);
  var objectY = getProperty(object);

  var playerWidth = getProperty("char" , "width");
  var playerHeight = getProperty("char" , "width");
  var objectWidth = getProperty(object , "width");
  var objectHeight = getProperty(object , "height");

  if(playerX + playerWidth >= objectX && playerX <= objectX + objectWidth){

    if(playerY + playerHeight >= objectY && playerY <= objectY + objectHeight){

      if(isDoor && !gameOver){

        gameOver = true;
        setScreen("screen_lose");

      }

      else if(isDoor && !gameOver && !getProperty(object,"hidden")){
        hideElement("cdoor1");
        showElement("odoor1");

      }
    }
  }
}

Answer 1

使用构造函数时，您需要使用 "new" 将它们添加为变量，如下所示：

var cdoor1 = new CollisionDetector("cdoor1" , true);
var char = new CollisionDetector("char" , true);

如果您愿意，可以在这里进一步阅读：https://www.w3schools.com/JS/js_object_constructors.asp

Answer 2

我只需要更改对象的 put getX 和 getY 位置而不是 getProperty()；抱歉我的错误，谢谢大家的帮助！

getProperty() property parameter value (undefined) is not a string.ERROR:

getProperty() property parameter value (undefined) is not a string.ERROR:

javascript

collision-detection

app-lab