demo component

import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import { Typography } from '@alifd/next';
import BackTop from '@shihuo/back-top';

class App extends Component {
  render() {
    return (
      <div>
        <div style={{ height: window.innerHeight }}>
          <Typography.Paragraph>第一屏</Typography.Paragraph>
        </div>
        <div style={{ height: window.innerHeight }}>
          <Typography.Paragraph>第二屏</Typography.Paragraph>
        </div>
        <div style={{ height: window.innerHeight }}>
          <Typography.Paragraph>第三屏</Typography.Paragraph>
        </div>
        <div style={{ height: window.innerHeight }}>
          <Typography.Paragraph>第四屏</Typography.Paragraph>
        </div>

        <BackTop />
      </div>
    );
  }
}

ReactDOM.render(<App />, mountNode);