getProperty（）属性参数值（未定义）不是字符串。错误：

Question

[请帮助我在游戏中发生碰撞，这里有个问题。它不断告诉我对象未定义。还说无法在元素“ cdoor1”和“ char”上获取属性“ undefined”。

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，您需要像“ new”那样将它们添加为变量：

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

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