useHistory 出现错误:
编译失败 ./src/pages/UserForm/_UserForm.js 尝试导入错误: 'useHistory' 未从 'react-router-dom' 导出。此错误发生在构建时,无法忽略。
react-router-dom 版本:
4.3.1
代码:
import React, { useState, Fragment } from 'react';
import FormUserDetails from './FormUserDetails';
import FormPersonalDetails from './FormPersonalDetails';
import Confirm from './Confirm';
import Success from './Success';
import Button from '@material-ui/core/Button';
import { Grid, makeStyles } from '@material-ui/core';
import { useHistory } from 'react-router-dom';
function UserForm() {
const [step, setStep] = useState(1);
const history = useHistory();
const StepButtons = (props) => (
<React.Fragment>
<Grid item xs={4}>
{props.value !== 'initial' ?
<Button variant="outlined" className={classes.button} onClick={(e) => previousStep(e)}>Back</Button> :
<Button variant="outlined" className={classes.button} onClick={(e) => reGenerate(e)}>Re-generate</Button>
}
</Grid>
<Grid item xs={4} />
<Grid item xs={4}>
{
props.value === 'confirm' ?
<Button variant="outlined" className={classes.button} style={{ float: "right" }} onClick={(e) => confirm(e)}>Confirm</Button> :
props.value !== 'final' ?
<Button variant="outlined" className={classes.button} style={{ float: "right" }} onClick={(e) => nextStep(e)}>Continue</Button> :
null
}
</Grid>
</React.Fragment>
);
const nextStep = (e) => {
e.preventDefault();
setStep(prevState => prevState + 1)
}
const previousStep = (e) => {
e.preventDefault();
setStep(prevState => prevState - 1)
}
const reGenerate = (e) => {
e.preventDefault();
}
const confirm = (e) => {
history.push('/')
}
return (
<div>
<h1>Hello</h1>
</div>
)
}
export default UserForm
useHistory
钩子! - norbitrial