Update main.js

root/src/assets/scripts/main.js

@@ -0,0 +1,76 @@
+let toggleClass = (el, className) => {
+  if (el.classList) {
+    el.classList.toggle(className)
+  } else {
+    let classes = el.className.split(' ')
+    let existingIndex = classes.indexOf(className)
+
+    if (existingIndex >= 0)
+      classes.splice(existingIndex, 1)
+    else
+      classes.push(className)
+
+    el.className = classes.join(' ')
+  }
+}
+
+let addClass = (className, el) => {
+  if (el.classList)
+    el.classList.add(className)
+  else
+    el.className += ' ' + className
+}
+
+let removeClass = (className, el) => {
+  if (el.classList)
+    el.classList.remove(className)
+  else
+    el.className = el.className.replace(new RegExp('(^|\\b)' + className.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');
+}
+
+let hasClass = (className, el) => {
+  if (el.classList)
+    return el.classList.contains(className)
+  else
+    return new RegExp('(^| )' + className + '( |$)', 'gi').test(el.className)
+}
+
+let throttle = (delay, callback) => {
+    var previousCall = new Date().getTime()
+    return function() {
+        var time = new Date().getTime()
+        if ((time - previousCall) >= delay) {
+            previousCall = time
+            callback.apply(null, arguments)
+        }
+    }
+}
+
+let debounce = (delay, callback) => {
+    var timeout = null
+    return function() {
+        if (timeout) {
+            clearTimeout(timeout);
+        }
+        var args = arguments
+        timeout = setTimeout(() => {
+            callback.apply(null, args)
+            timeout = null
+        }, delay)
+    }
+}
+
+let ready = fn => {
+  if (document.readyState != 'loading'){
+    fn();
+  } else {
+    document.addEventListener('DOMContentLoaded', fn);
+  }
+}
+
+ready( () => {
+  window.addEventListener('scroll', throttle(200, e => {
+  }))
+  window.addEventListener('scroll', debounce(200, e => {
+  }))
+})