反应 js 钩子使用效果无限循环

Question

我正在玩反应钩子，并在 https://www.valentinog.com/blog/hooks/处跟随tutorail。我放入空数组作为文档之后的第二个参数，并且由于某种原因我仍然得到无限循环。

import React, { useState, useEffect } from "react";
export default function useDataLoader() {
  const [data, setData] = useState([]);
  useEffect(() => {
    fetch("http://api.icndb.com/jokes/random")
      .then(response => response.json())
      .then(data => {
        setData(data.value.joke)
        console.log(data)
      }, []);
  });
  return (
    <div>
      <div>
        {data}
      </div>
    </div>
  );
}

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import Hook from './components/Hook'
import DataLoader from './components/DataLoader'
class App extends Component {
  render() {
    return (
      <div className="App">
        <Hook />
        <DataLoader/>
      </div>
    );
  }
}
export default App;

Answer 1

[]在

错误的位置。您将其传递给fetch().then()而不是useEffect

  useEffect(() => {
    fetch("http://api.icndb.com/jokes/random")
      .then(response => response.json())
      .then(data => {
        setData(data.value.joke)
        console.log(data)
      });
  }, []);