小编Kar*_*nan的帖子

我在 React 中使用 Formik 和 Yup，当我单击提交按钮并触发 onSubmit 事件时，在事件内部，fetch 函数调用了两次，

import React, { Component } from 'react';
import Button from '@material-ui/core/Button';
import Container from '@material-ui/core/Container';
import { TextField } from 'formik-material-ui';
import { Formik, Field, Form } from 'formik';
import * as Yup from 'yup';
class LoginForm extends Component {
    constructor(props) {
        super(props);
        this.state = {classes: this.props.classes, isLoading: false }
    }
render() {
   return (
        <Formik
            initialValues={initialFormValues}
            validationSchema={validationFrom}
            onSubmit={(values, actions) => {
                this.setState({ isLoading: true });
                console.log(values);
                actions.setSubmitting(false);
                console.log('SUCCESS!! :-)\n\n' + …