小编sea*_*guy的帖子

我正在做一个带有反应钩子的简单数组，但它没有更新状态。谁能指出我要在这里做什么？

import React, { useState } from "react";
import ReactDOM from "react-dom";

import "./styles.css";

const dogs = [{ name: "fido", age: 22 }, { name: "will", age: 50 }];

function App() {
  const [dogList, setDogList] = useState(dogs);

  const sortByAge = () => {
    const sorted = dogList.sort((a, b) => {
      return b.age - a.age;
    });
    setDogList(sorted);
    alert(sorted[0].name);
  };

  return (
    <div>
      {dogs.map((dog, i) => {
        return <p key={i}>{dog.name}</p>;
      })}
      <div onClick={sortByAge}>sort by age</div>
    </div>
  );
}

const rootElement = document.getElementById("root"); …

我正在玩 formik 和 yup 反应，我想知道在成功请求后进行重定向的最佳方法是什么？

我尝试传入历史对象，但它给了我一个错误，说它是全局的：

const SignUp = withFormik({
  mapPropsToValues({
    username,
    email,
    password,
    passwordConfirm,
    registerUser
  }) {
    return {
      username: username || '',
      email: email || '',
      password: password || '',
      passwordConfirm: passwordConfirm || ''
    };
  },

  validationSchema: Yup.object().shape({
    username: Yup.string()
      .required('must have username')
      .min(5, 'username must be 5 characters long'),
    email: Yup.string()
      .email('Please enter a valid email')
      .required('Email is required'),
    password: Yup.string().required('No password provided.'),
    passwordConfirmation: Yup.string().oneOf(
      [Yup.ref('password'), null],
      'Passwords must match'
    )
  }),

  handleSubmit(values, { resetForm }) { …