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符号“&$checked”是什么意思

import React from 'react';
import Checkbox from '@material-ui/core/Checkbox';
import { createMuiTheme, makeStyles, ThemeProvider } from '@material-ui/core/styles';
import { orange } from '@material-ui/core/colors';

const useStyles = makeStyles(theme => ({
  root: {
    color: theme.status.danger,
    '&$checked': {
      color: theme.status.danger,
    },
  },
  checked: {},
}));

function CustomCheckbox() {
  const classes = useStyles();

  return (
    <Checkbox
      defaultChecked
      classes={{
        root: classes.root,
        checked: classes.checked,
      }}
    />
  );
}

const theme = createMuiTheme({
  status: {
    danger: orange[500],
  },
});

export default function CustomStyles() {
  return (
    <ThemeProvider theme={theme}> …
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