如何解决带有样式的实质性用户界面
你们在使用Material UI的withStyles钩子向组件添加自定义样式时遇到了这种情况。
这是我的package.json:
{
"name": "socialapp-client","version": "0.1.0","private": true,"dependencies": {
"@material-ui/core": "^4.11.0","@testing-library/jest-dom": "^4.2.4","@testing-library/react": "^9.5.0","@testing-library/user-event": "^7.2.1","axios": "^0.20.0","dayjs": "^1.8.35","react": "^16.13.1","react-dom": "^16.13.1","react-router-dom": "^5.2.0","react-scripts": "3.4.3"
},"scripts": {
"start": "react-scripts start","build": "react-scripts build","test": "react-scripts test","eject": "react-scripts eject"
},"eslintConfig": {
"extends": "react-app"
},"browserslist": {
"production": [
">0.2%","not dead","not op_mini all"
],"development": [
"last 1 chrome version","last 1 firefox version","last 1 safari version"
]
},"proxy": "<link to my Google firebase API>"
}
这是App.js代码
import React,{ Component } from "react";
import { browserRouter as Router,Switch,Route } from "react-router-dom";
import { Home } from "./pages/home";
import { login } from "./pages/login";
import { signup } from "./pages/signup";
import { Navbar } from "./components/Navbar";
import { ThemeProvider,createMuiTheme } from "@material-ui/core/styles";
import "./App.css";
const theme = createMuiTheme({
palette: {
primary: { main: "#29b6f6" },secondary: { main: "#ffa726" },},});
class App extends Component {
render() {
return (
<ThemeProvider theme={theme}>
<div className="App">
<Router>
<Navbar></Navbar>
<div className="container">
<Switch>
<Route exact path="/" component={Home} />
<Route path="/login" component={login} />
<Route path="/signup" component={signup} />
</Switch>
</div>
</Router>
</div>
</ThemeProvider>
);
}
}
export default App;
import React,{ Component } from 'react'
import withStyles from '@material-ui/core/styles/withStyles';
const styles = {
mantra:{
textAlign: 'center'
}
}
export class login extends Component {
render() {
const { classes } = this.props;
console.log(classes.mantra)
return (
<div>
<h1>login Page</h1>
</div>
)
}
}
export default withStyles(styles)(login);
根据对文档的检查,我可以正确地进行所有操作,但是我被错误阻止
TypeError: Cannot read property 'mantra' of undefined
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