用createGlobalStyle定义全局样式

1.style.js

import {createGlobalStyle } from 'styled-components'

export const Globalstyle = createGlobalStyle`
  body {
    margin: 0;
    padding: 0;
    color:red;
  }
  `

2.在项目主文件导入样式，按组件方式使用

import React , {Component} from 'react';
import {Globalstyle} from './style.js';


class App extends Component {
  render() {
      return (
        <div >
          <Globalstyle/>
          hello world
        </div>
      );
    }
}


export default App;