perf(form): improve the form function

mock/demo/select-demo.ts

@@ -0,0 +1,24 @@
+import { MockMethod } from 'vite-plugin-mock';
+import { resultSuccess } from '../_util';
+
+const demoList = (() => {
+  const result: any[] = [];
+  for (let index = 0; index < 20; index++) {
+    result.push({
+      label: `选项${index}`,
+      value: `${index}`,
+    });
+  }
+  return result;
+})();
+
+export default [
+  {
+    url: '/api/select/getDemoOptions',
+    timeout: 4000,
+    method: 'get',
+    response: ({ query }) => {
+      return resultSuccess(demoList);
+    },
+  },
+] as MockMethod[];