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[前端]useEffect报错：useEffect must not return anything besides a function, which is used for clean-up.
如下代码：
useEffect(async() => {
await test();
}, []);
function test (){
return new Promise((resove,reject)=>{
setTimeout(function(){
setFormData({
remember: true,
username:"doubleyong",
password:"123"
})
console.log("upload state")
resove();
},2000)
});
}
报错： Warning: useEffect 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: 原因： 提示不能直接在useEffect中使用async， 报错信息中也给出了解决方式，就是把async放在useEffect里面，在立即调用 修改如下，重新运行这个警告就消失了。 解决方案： useEffect(()=>{
const temp = async() => {
await test();
}
temp()
}, []); |
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