refactor(defaultTheme): refine focusChildOnNavUp()

Author: marjune163

src/tpl/defaultTheme/frontend/index.js

@@ -181,7 +181,7 @@
 			var sepIndex = url.indexOf('?');
 			if (sepIndex < 0) sepIndex = url.indexOf('#');
 			if (sepIndex >= 0) {
-				url = url.substring(0, sepIndex);
+				url = url.slice(0, sepIndex);
 			}
 			return url;
 		}
@@ -193,16 +193,16 @@
 		var currUrl = extractCleanUrl(location.href);
 
 		if (prevUrl.length <= currUrl.length) return;
-		if (prevUrl.substring(0, currUrl.length) !== currUrl) return;
-		var goesUp = prevUrl.substring(currUrl.length);
+		if (prevUrl.slice(0, currUrl.length) !== currUrl) return;
+		var goesUp = prevUrl.slice(currUrl.length);
 		if (currUrl[currUrl.length - 1] !== '/' && goesUp[0] !== '/') return;
 		var matchInfo = /[^/]+/.exec(goesUp);
 		if (!matchInfo) return;
 		var prevChildName = matchInfo[0];
 		if (!prevChildName) return;
 		prevChildName = decodeURIComponent(prevChildName);
 
-		var items = document.body.querySelectorAll(selectorItem);
+		var items = document.body.querySelectorAll(selectorItemNotNone);
 		items = Array.prototype.slice.call(items);
 		var selectorName = '.field.name';
 		var selectorLink = 'a';
@@ -212,7 +212,7 @@
 			if (!elName) continue;
 			var text = elName.textContent;
 			if (text[text.length - 1] === '/') {
-				text = text.substring(0, text.length - 1);
+				text = text.slice(0, -1);
 			}
 			if (text !== prevChildName) continue;
 			var elLink = item.querySelector(selectorLink);