Formik中的日期验证：‘购买日期’必须早于‘销售日期’

import React from 'react';
import { Formik, Form, Field, ErrorMessage } from 'formik';

const initialValues = {
  purchaseDate: '',
  saleDate: ''
};

const validatePurchaseDate = (values) => {
  const { purchaseDate, saleDate } = values;
  if (purchaseDate >= saleDate) {
    return '购买日期必须早于销售日期';
  }
};

const validateSaleDate = (values) => {
  // 可以在此处添加销售日期的其他验证规则
};

const MyForm = () => (
  <Formik
    initialValues={initialValues}
    onSubmit={(values) => {
      // 处理表单提交
    }}
  >
    <Form>
      <div>
        <label htmlFor="purchaseDate">购买日期：</label>
        <Field type="date" name="purchaseDate" />
        <ErrorMessage name="purchaseDate" component="div" />
      </div>
      <div>
        <label htmlFor="saleDate">销售日期：</label>
        <Field type="date" name="saleDate" />
        <ErrorMessage name="saleDate" component="div" />
      </div>
      <button type="submit">提交</button>
    </Form>
  </Formik>
);

export default MyForm;