我对react和node非常陌生，我已经设法为一个简单的todo列表创建了一个API。 我已经从api中获取了数据并将其呈现在屏幕上。

如果在UseEffect()钩子上保留依赖数组为空，它将只呈现一次，不会循环。 但是如果我添加了一个新的Todo，它将不会更新列表，除非我刷新。 因此，我将todos状态放入依赖项数组中，当我添加新项时，它将显示新项，但如果我查看开发工具中的network选项卡，它将以无限循环的方式命中api。 我做错了什么？

下面是代码:

应用程序

import React, { useState, useEffect } from "react";
import Todo from "./components/Todo";
import Heading from "./components/Heading";
import NewTodoForm from "./components/NewTodoForm";

const App = () => {
  const [todos, setTodos] = useState([]);

  useEffect(() => {
    const getTodos = async () => {
      const res = await fetch("http://localhost:3001/api/todos");
      const data = await res.json();
      setTodos(data);
    };

    getTodos();
  }, []);

  return (
    <div className="container">
      <Heading todos={todos} />
      <section className="todos-container">
        <ul className="todos">
          {todos.map((todo) => (
            <Todo key={todo._id} todo={todo} />
          ))}
        </ul>
      </section>
      <section className="todo-form">
        <NewTodoForm />
      </section>
    </div>
  );
};

export default App;

航向

import React from "react";

const Heading = ({ todos }) => (
  <header>
    <h1>Todos</h1>
    <p>
      {todos.length} {todos.length === 1 ? "Item" : "Items"}
    </p>
  </header>
);

export default Heading;

TODO

import React, { useState } from "react";

const Todo = ({ todo }) => (
  <li>
    {todo.name}
    <input type="checkbox" />
  </li>
);

export default Todo;

纽托多形式

import React, { useState } from "react";
import { Plus } from "react-feather";

const NewTodoForm = () => {
  const [formData, setFormData] = useState({
    name: "",
    completed: false,
  });

  const { name } = formData;

  const handleOnChange = (e) => {
    setFormData({
      ...formData,
      [e.target.name]: e.target.value,
    });
  };

  const handleSubmit = async (e) => {
    e.preventDefault();

    await fetch("http://localhost:3001/api/todos", {
      method: "POST",
      headers: {
        Accept: "application/json",
        "Content-Type": "application/json",
      },
      body: JSON.stringify(formData),
    });

    setFormData({
      name: "",
      completed: false,
    });
  };
  return (
    <form onSubmit={handleSubmit}>
      <div className="form-control">
        <Plus className="plus" />
        <input
          name="name"
          type="text"
          placeholder="Add New Item"
          onChange={handleOnChange}
          value={name}
        />
        <button>Add</button>
      </div>
    </form>
  );
};

export default NewTodoForm;

如果我将所有组件注释掉，并且只有App组件，当我将todos添加到useEffect()钩子的依赖数组时，它仍然会无限循环。