message: doc(useEventTarget): add initialValue for demo2 to remove warning in development
diff: @@ -11,6 +11,7 @@ import { useEventTarget } from 'ahooks';
  export default () => {
  const [value, { onChange, reset }] = useEventTarget({
  + initialValue: '',
  transformer: (val: string) => val.replace(/[^\d]/g, ''),
  });
  