extracted urlParam jquery addon

index.html

@@ -62,6 +62,7 @@
         </div>
 
         <script src="https://static.e7d.io/libs/jquery/3.1.1/jquery.min.js"></script>
+        <script src="js/urlParam.jquery.js"></script>
         <script src="js/gamepad.js"></script>
         <script src="js/app.js"></script>
     </body>

js/gamepad.js

@@ -1,12 +1,3 @@
-$.urlParam = function(name) {
-    let results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
-    if (results === null) {
-        return null;
-    } else {
-        return decodeURIComponent(results[1]) || 0;
-    }
-};
-
 class Gamepad {
     constructor() {
         this.haveEvents = 'ongamepadconnected' in window;

js/urlParam.jquery.js

@@ -0,0 +1,8 @@
+$.urlParam = function(name) {
+    let results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
+    if (results === null) {
+        return null;
+    } else {
+        return decodeURIComponent(results[1]) || 0;
+    }
+};