update：搜索栏组件

src/components/app-searchbar/app-searchbar.vue

@@ -51,6 +51,17 @@ export default class AppSearchbar extends Vue {
      */
     @Prop() fields: any;
 
+    @Watch('items',{immediate: true})
+    onItemsChange(newItems: any[]) {
+        if (newItems.length == 0) {
+            this.items.push({
+                field: null,
+                mode: null,
+                editor: null
+            })
+        }
+    }
+
     /**
      * 属性项集合
      *
@@ -69,13 +80,6 @@ export default class AppSearchbar extends Vue {
         if(!this.fields) {
             return;
         }
-        if (this.items.length == 0) {
-            this.items.push({
-                field: null,
-                mode: null,
-                editor: null
-            })
-        }
         this.fields.forEach((field: any) => {
             let index: number = this.fieldItems.findIndex((item: any) => Object.is(item.value, field.prop));
             if(index < 0) {