Add button and javascript function to page2 to toggle LED, using 'REST' API

www/page2.html

@@ -28,10 +28,24 @@
 </center>
 <HR>
 <H2>This is the second page</H2>
-<p>This page is just to demonstrate linking to other local pages.
+<p>This page is just to demonstrate linking to other local pages, and to test JavaScript stuff.
+<p align='center'>
+    <button type='button' class='btn' align='center' style='height:30px; width:70px' onclick='toggleLED()'>Toggle</button>
+</p>
 <BR><BR><BR>
 Send questions to <a href="mailto:supporrt@emacinc.com">support@emacinc.com</a>.
 <HR>
 <a href="index.html">Home</a>
+<script>
+  function toggleLED() {
+    var xhr = new XMLHttpRequest();
+    xhr.open("POST", "/led_control", true);
+    xhr.setRequestHeader('Content-Type', 'application/json');
+    xhr.send(JSON.stringify({
+      number: 1,
+      action: 'toggle'
+    }));
+  };
+</script>
 </body>
 </html>