Remove unused directive

client/js/main.js

@@ -101,21 +101,6 @@ var router = new VueRouter({
     routes: routes
 })
 
-
-Vue.directive('demo', function (el) {
-    function isInViewport(element) {
-        var rect = element.getBoundingClientRect();
-        var html = document.documentElement;
-        return (
-            rect.top >= 0 &&
-            rect.left >= 0 &&
-            rect.bottom <= (window.innerHeight || html.clientHeight) &&
-            rect.right <= (window.innerWidth || html.clientWidth)
-        );
-    }
-    console.log(el);
-})
-
 new Vue({
     el: '#app',
     router: router,
@@ -123,12 +108,3 @@ new Vue({
         routes: routes
     }
 })
-
-// Vue.directive('demo', {
-//     params: ['$el'],
-//     paramWatchers: {
-//         $el: function (val, oldVal) {
-//             console.log(val);
-//         }
-//     }
-// })