fix(login-page): fix render children parameter issue.

Author: jaywcjlove

core/src/Render.tsx

@@ -6,11 +6,11 @@ export type RenderChildren =
   | { children?: React.ReactNode };
 
 export const Render: FC<RenderChildren> = ({ children }) => {
-  const { fields = {}, buttons = {}, extra = {}, blocks = {}, data } = useStore();
+  const { fields = {}, buttons = {}, extra = {}, $$index = {}, blocks = {}, data } = useStore();
   const childs = typeof children === 'function' ? [] : Children.toArray(children);
   return (
     <Fragment>
-      {typeof children === 'function' && !isValidElement(children) && children({ fields, buttons, blocks, extra }, { ...data })}
+      {typeof children === 'function' && !isValidElement(children) && children({ fields, buttons, blocks, extra, $$index }, { ...data })}
       {typeof children !== 'function' && childs.map((child, key) => {
         if (!isValidElement(child)) return null;
         return cloneElement(child, {