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外贸网站建设的重要性,注册一个公司多少钱,合肥中小企业网站制作,网页设计与制作实例教程react 自定义 hooks 简介一句话：使用自定义hooks可以将某些组件逻辑提取到可重用的函数中。自定义hooks是一个从use开始的调用其他hooks的Javascript函数。下面以一个案例: 新闻发布操作，来简单说一下react 自定义 hooks。不使用自定义hooks时 …

react 自定义 hooks

简介

一句话：使用自定义hooks可以将某些组件逻辑提取到可重用的函数中。

自定义hooks是一个从use开始的调用其他hooks的Javascript函数。

下面以一个案例: 新闻发布操作，来简单说一下react 自定义 hooks。

不使用自定义hooks时

未发布新闻 – UnPublished.js

// UnPublished.jsimport React, { useEffect, useState } from "react";
import { fetchGetUnPublishedNewsList } from "../../../utils/api";
import NewsPublish from "./components/NewsPublish";import { reactLocalStorage } from "reactjs-localstorage";export default function UnPublished() {// 获取用户权限列表const { roleId, region, username } = reactLocalStorage.getObject("token");const [dataSource, setdataSource] = useState([]);useEffect(() => {const fetchData = async () => {let params = {author: username,publishState: 1, // publishStateList = ['未发布','待发布','已发布','已下线']};const newsListData = await fetchGetUnPublishedNewsList(params); setdataSource(newsListData);};fetchData();}, []);return (<div><NewsPublish dataSource={dataSource}></NewsPublish></div>);
}

发布新闻 – Published.js

// Published.jsimport React, { useEffect, useState } from "react";
import { fetchGetUnPublishedNewsList } from "../../../utils/api";
import NewsPublish from "./components/NewsPublish";import { reactLocalStorage } from "reactjs-localstorage";export default function UnPublished() {// 获取用户权限列表const { roleId, region, username } = reactLocalStorage.getObject("token");const [dataSource, setdataSource] = useState([]);useEffect(() => {const fetchData = async () => {let params = {author: username,publishState: 3, // publishStateList = ['未发布','待发布','已发布','已下线']};const newsListData = await fetchGetUnPublishedNewsList(params); setdataSource(newsListData);};fetchData();}, []);return (<div><NewsPublish dataSource={dataSource}></NewsPublish></div>);
}

很明显，以上两个文件呈现效果不同，但使用的 逻辑代码大部分相同 时，这些逻辑代码我们就可以使用hooks进行逻辑复用。

使用自定义hooks

我们抽离以上两个文件里可以复用的逻辑代码，抽离相同逻辑代码部分，自定义hooks (即：把fetch请求数据部分，单独抽离出来),新建一个usePublish的文件。

./components/usePublish

// ./components/usePublishimport { useEffect, useState } from "react";
import { fetchGetUnPublishedNewsList } from "../../../../utils/api";
import { reactLocalStorage } from "reactjs-localstorage";function usePublish(type) { // 注意这里// 获取用户权限列表const { username } = reactLocalStorage.getObject("token");const [dataSource, setdataSource] = useState([]);useEffect(() => {const fetchData = async () => {let params = {author: username,publishState: type, // publishStateList = ['未发布','待发布','已发布','已下线']};const newsListData = await fetchGetUnPublishedNewsList(params);setdataSource(newsListData);};fetchData();}, []);return { dataSource };
}export default usePublish;

未发布新闻 – UnPublished.js 改进

import NewsPublish from "./components/NewsPublish"; import usePublish from "./components/usePublish"; // 引入自定义hooksexport default function UnPublished() {  const { dataSource } = usePublish(1);   // 使用自定义hooksreturn (<div> <NewsPublish dataSource={dataSource}></NewsPublish></div>);
}

发布新闻 – Published.js 改进

import NewsPublish from "./components/NewsPublish";import usePublish from "./components/usePublish"; // 引入自定义hooksexport default function Published() {const { dataSource } = usePublish(2); // 使用自定义hooksreturn (<div><NewsPublishdataSource={dataSource}></NewsPublish></div>);
}