setData] = useState([]); const fetchData = () => { fetch('https://api.example.com/data') .then(response => response.json()) .then(data => setData(data)) .catch(error => console.error(error)); }; useEffect(() => { fetchData(); }, []); return ( {data.map...
我使用了一个react钩子: useEffect来获取数据,我还使用了.map来呈现一个产品数组。运行npm后,出现错误: xhr.js:178 GET http://localhost:3000/api/products 404 (未找到) import React, { useState, useEffect// fetchDate from server // sama dengan component did moun 浏览37提问于2020-06-25得票数 0 ...
但stockData状态没有同步更新。useEffect钩子具有异步行为,因此当您尝试在handleSubmit函数中访问它时,stoc...
在你的例子中,如果API调用成功,dosa数组将被填充。然后你的useEffect钩子变成这样:
极速了解-Next.js的数据获取1 | 通过fetch API可以在服务端获取数据,fetch到的数据不会被缓存。如果这个路由没有使用动态API,那么在next build命令会进行数据的预渲染。把dynamic设置为force-dynamic可以避免被预渲染。在使用cookies, headers, searchParams时,不会预渲染,此时默认是force-dynamic。fetch也可以获取服务...
)从Web API获取数据?您试图在设置符号状态后立即访问stockData,但stockData状态没有同步更新。useEffect...
const apiUrl = process.env.EXPO_PUBLIC_API_URL; const ProfileFormSchema = z.object({ username: z.string().min(1, 'Username is required.'), phone: z.string().min(10, 'Phone number is invalid.').max(11, 'Phone number is invalid.'), @@ -42,7 +44,6 @@ function checkChanges(...
Once signed up, please ensure that you subscribe to the Jokes by API-Ninjas before using the API in your app. jsCopy import React, { useState, useEffect } from "react";function Joke() { const [joke, setJoke] = useState(null);
当使用Jest模拟API错误响应时,组件中未定义Fetch 我正在测试一个组件,该组件使用useEffect钩子从API获取数据,更新状态,然后构建该组件。我以这个堆栈溢出答案为例,成功模拟了几个测试的API响应。我现在正试图编写一个测试,模拟API返回的错误。我得到一个错误,将TypeError: Cannot read property 'then' of undefined表示...
You are calling the Fetch API and passing in the URL to the JSONPlaceholder API. Then a response is received. However, the response you get is not JSON, but an object with a series of methods that can be used depending on what you want to do with the information. To convert the objec...