充多少送红包规则为空时，要显示出一个表单项

hdApp/src/admin/hb/sendHb.vue

@@ -68,7 +68,20 @@ export default {
     getHbRulesList() {
       hbRulesList().then(res => {
         if(res.code == 1) {
-          this.rules = res.data.list
+          if(res.data.list.length == 0) {
+            this.rules = [
+              {
+                id: '',
+                amount: '',
+                num: '',
+                hbAmount: '',
+                duration: '',
+                miniCost: ''
+              }
+            ]
+          } else {
+            this.rules = res.data.list
+          }
         } else {
           this.$msg(res.msg);
         }