[英]React Use State Hook error TypeError: setUser is not a function
当我按下提交按钮时,我收到此错误, TypeError: setUser is not a function 。 我正在尝试从表单中获取数据并将其存储。
APP.JS
import React, { useState } from 'react';
import User from './Components/User';
import Card from './Components/Card';
function App() {
const {user, setUser} = useState([{username: "", age: 1}]);
const handleUserAdd = (user1) => {
setUser(user1);
console.log(user);
}
return (
<div className="App">
<Card>
<User onUserAdd={handleUserAdd}/>
</Card>
</div>
);
}
export default App;
用户.JS
import React, { useState } from 'react';
const User = (props) => {
const {name, setName} = useState("");
const {years, setYears} = useState(1);
const handleOnNameChange = (e) => {
setName(e.target.value);
}
const handleOnAgeChange = (e) => {
setYears(e.target.value);
}
const handleOnSubmit = (e) =>{
e.preventDefault();
const user = {
username: name,
age: years
};
props.onUserAdd(user);
setName("");
setYears();
}
return (
<>
<form onSubmit={handleOnSubmit}>
<div class="mb-3">
<label for="exampleInputEmail1" class="form-label">Username:</label>
<input class="form-control" aria-describedby="emailHelp" value={name} onChange={handleOnNameChange} />
</div>
<div class="mb-3">
<label for="exampleInputPassword1" class="form-label">Age:</label>
<input type="number" min={1} max={120} class="form-control" value={years} onChange={handleOnAgeChange} />
</div>
<button type="submit" class="btn btn-primary">Add User</button>
</form>
</>
);
}
export default User;
错误截图
我以前使用过 useState 钩子,但从未发生过,如果您能帮我解决这个问题,我将不胜感激!
useState
返回一个数组,而不是 object。 你应该像这样解构它;
const [user, setUser] = useState([{username: "", age: 1}]);
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