debug搜索历史组件 清除功能完善 --fix1

src/components/app-search-history/app-search-history.vue

@@ -190,6 +190,7 @@ export default class AppRoundList extends Vue{
      * @memberof AppSearchHistory
      */ 
     public searchVal($event:any){
+      if ($event.target) {
         let val:any = $event.target.value;
         val = val.trim();
         if (val === "") {
@@ -216,6 +217,7 @@ export default class AppRoundList extends Vue{
           localStorage.setItem('historyStorage', JSON.stringify(this.historyStorage))
         }
       }
+    }
 
    /**
      * 清除搜索历史