Promises and useEffect(async () => …) are not supported, but you can call an async function inside an effect 这就是为什么不能直接在useEffect中使用async函数, 因此,我们可以不直接调用async函数,而是像下面这样: function App() { const [data,
所以你会在控制台日志中看到以下警告: Warning: An effect function must not return anything besides a function, which is used for clean-up. It looks like you wrote useEffect(async () => ...) or returned a Promise. Instead, write the async function inside your effect and call it immediately...
or returned a Promise...Instead, write the async function inside your effect and call it immediately: 这就是为什么不能直接在 useEffect 中使用...async 函数的原因。...因此,我们可以不直接在 useEffect 里使用用 async 函数,需要把函数提取出来,像下面这样: import React, { useState, useEffect } from...
The sectionNote on fetching data insideuseEffectwas added The initial explanation of why you couldn't declareuseEffect's callback as async was fixed (the initial version was incorrect) ThefetchDatacalls were added acatchfor errors. It's a bit more bloat but it's something that you absolutely...
Also, you must be careful if you are using async callings inside the useEffect hook. I was concerned about this but I was doing it wrong in some parts. I'll share with you what I'm doing with my code now, which thanks to the tests and the library, I think is more solid: I'm ...
Since async functions insideuseEffectare quite common, rendering a component containing such a hook should wait for the component updates to have finished (with a small timeout). DoctypeRosenthal, StanleySathler, btoo, PCreations, Joeoeoe, jessPier, iamawebgeek, ivancho2, rtrembecky, hoanghieu...
How does useEffect support async...await... Even the callback function of useEffect cannot use async...await, so I use it directly. Approach 1: Create an asynchronous function (async...await method), and then execute the function.
Not required. Array. Works as 2nd argument ofuseEffecthook. When one of items changed,AsyncPaginatecleans all cached options. loadOptionsOnMenuOpen Not required. Boolean. Iffalseoptions will not load on menu opening. mapOptionsForMenu Not required. Function. Post-mapping of loaded options to disp...
You cannot directly make the callback function supplied to the useEffect hook async because: async functions implicitly return a promise, and; useEffect expects its callback to either return nothing or a clean-up function.When you attempt to make useEffect's callback async, you will see the ...
使用async/await在一个useEffect中合并两个Axios调用字符串 你能告诉我你得到了什么样的错误，因为我没有...