fix bug

apps/classroom/Tpl/default/Index/search_w3g.html

@@ -422,7 +422,7 @@
 				searchSave: function () {
 					let item = localStorage.getItem("search");
 					//['考研课程', '事业单位考试', '公务员考试'];
-					let data = item ? item : [];
+					let data = item.length > 0 ? item : [];
 					if (data.indexOf(this.keyword) < 0) {
 						data.push(this.keyword);
 					}