styled-components 全局样式定义，由injectGlobal改为createGlobalStyle

The injectGlobal API was removed and replaced by createGlobalStyle in styled-components v4. 原文链接

官方链接 createGlobalStyle

具体使用

import { createGlobalStyle } from 'styled-components';

export const GlobalStyle = createGlobalStyle`
  html, body, div, span, applet, object, iframe,
  h1, h2, h3, h4, h5, h6, p, blockquote, pre,
  a, abbr, acronym, address, big, cite, code,
  del, dfn, em, img, ins, kbd, q, s, samp,
  small, strike, strong, sub, sup, tt, var,
  b, u, i, center,
  dl, dt, dd, ol, ul, li,
  fieldset, form, label, legend,
  table, caption, tbody, tfoot, thead, tr, th, td,
  article, aside, canvas, details, embed, 
  figure, figcaption, footer, header, hgroup, 
  menu, nav, output, ruby, section, summary,
  time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
  }
  /* HTML5 display-role reset for older browsers */
  article, aside, details, figcaption, figure, 
  footer, header, hgroup, menu, nav, section {
    display: block;
  }
  body {
    line-height: 1;
  }
  ol, ul {
    list-style: none;
  }
  blockquote, q {
    quotes: none;
  }
  blockquote:before, blockquote:after,
  q:before, q:after {
    content: '';
    content: none;
  }
  table {
    border-collapse: collapse;
    border-spacing: 0;
  }
`

在App.js中导入

import { GlobalStyle } from './style.js';
import React, { Fragment } from 'react';
function App() {
  return (
    <Fragment>
      <GlobalStyle />
      <Header />
    </Fragment>
  );
}

参考链接：https://www.cnblogs.com/cxx9759/p/9807866.html