删除多余函数

src/views/Register.vue

@@ -504,13 +504,6 @@ const cities = computed(() => {
   return Array.from(citySet).sort();
 });
 
-const filteredDistricts = computed(() => {
-  if (!registerForm.city) return [];
-  return regions.value.filter(
-    (region) => region.city_name === registerForm.city
-  );
-});
-
 // 自定义验证函数
 const validateUsername = (rule, value, callback) => {
   if (!value) {