perf(tpl): find itemList before check has-delete class name

Find `.item-list` first, then check if it has class `has-delete`,
instead of searching `.has-delete` for the whole document.

Author: marjune163

src/tpl/assert/main.js

@@ -44,10 +44,17 @@
 	}
 
 	function enableNonRefreshDelete() {
-		var itemList = document.querySelector('.item-list.has-deletable');
+		var itemList = document.querySelector('.item-list');
 		if (!itemList || !itemList.addEventListener) {
 			return;
 		}
+		if (itemList.classList) {
+			if (!itemList.classList.contains('has-deletable')) {
+				return;
+			}
+		} else if (itemList.className.indexOf('has-deletable') < 0) {
+			return;
+		}
 
 		itemList.addEventListener('click', function (e) {
 			if (e.defaultPrevented || !e.target || e.target.className.indexOf('delete') < 0) {

src/tpl/assert/main.js.go

@@ -39,10 +39,17 @@ upload.addEventListener('dragleave', onDragLeave);
 upload.addEventListener('drop', onDrop);
 }
 function enableNonRefreshDelete() {
-var itemList = document.querySelector('.item-list.has-deletable');
+var itemList = document.querySelector('.item-list');
 if (!itemList || !itemList.addEventListener) {
 return;
 }
+if (itemList.classList) {
+if (!itemList.classList.contains('has-deletable')) {
+return;
+}
+} else if (itemList.className.indexOf('has-deletable') < 0) {
+return;
+}
 itemList.addEventListener('click', function (e) {
 if (e.defaultPrevented || !e.target || e.target.className.indexOf('delete') < 0) {
 return;