adding 502 error

games/space-invaders502/js/objects.js

@@ -0,0 +1,29 @@
+// Game objects
+var hero = {};
+var playerShots = [];
+var enemyShots = [];
+
+var shotSpeed = 200;
+
+var RIGHT = 1, LEFT = 0;
+var enemies = [];
+var enemyDirection = RIGHT;
+var loadEnemy = function(offset, json){
+  var size = 32;
+
+  for (var i = 0; i< json.length; i++){
+    var pos = json[i];
+    var enemy = {x: offset.x + pos.x * size, y: offset.y + pos.y * size}  ;
+    enemies.push(enemy);
+  }
+}
+
+loadJSON('enemies.json',
+   function(data) {
+
+       loadEnemy({ x: 50, y: 50 }, data.five);
+       loadEnemy({ x: 180, y: 50 }, data.zero);
+       loadEnemy({ x: 300, y: 50 }, data.two);
+     },
+   function(xhr) { console.error(xhr); }
+);