在material ui头像组件上显示悬停时的用户名称

npm install @material-ui/core

import React from 'react';
import Avatar from '@material-ui/core/Avatar';
import Tooltip from '@material-ui/core/Tooltip';
import { makeStyles } from '@material-ui/core/styles';

const useStyles = makeStyles((theme) => ({
  avatar: {
    margin: theme.spacing(1),
    backgroundColor: theme.palette.secondary.main,
  },
}));

const UserAvatar = ({ username }) => {
  const classes = useStyles();

  return (
    <Tooltip title={username}>
      <Avatar className={classes.avatar}>{username.charAt(0)}</Avatar>
    </Tooltip>
  );
};

<UserAvatar username="John Doe" />