如何在reactjs中创建api调用new hook api并在组件之间共享？

Question

如何在新的reactjs钩子api中调用restApi.并使用useEffects和useState重用数据？我想只重用组件之间的数据.

import { useState, useEffect } from "react";
export default function getAdvice(url) {
    fetch(`http://api.adviceslip.com/advice`)
        .then(res => res.json())
        .then(res => console.log(res))
        .catch(err => console.log(err)
}

Answer 1

您可以创建一个自定义挂钩,用于创建advice在网络请求完成时设置的新状态.

从给定的函数返回一个函数,useEffect当使用它的组件重新渲染或卸载组件时,该函数会取消您的请求.您还可以将url数组作为第二个参数,useEffect以便仅在url实际更改时重新运行网络请求.

例

const { useState, useEffect } = React;

function useAdvice(url) {
  const [advice, setAdvice] = useState(null);

  useEffect(
    () => {
      const timeout = setTimeout(() => {
        setAdvice(`Use ${url} to get some nice advice`);
      }, 1000);
      
      return () => clearTimeout(timeout);
    },
    [url]
  );

  return advice;
}

function App() {
  const advice = useAdvice("https://google.com");

  return <div>{advice}</div>;
}

ReactDOM.render(<App />, document.getElementById("root"));

<script src="https://unpkg.com/react@16.7.0-alpha.0/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16.7.0-alpha.0/umd/react-dom.production.min.js"></script>
<div id="root"></div>