react css模块管理工具 styled-components

1. 首先全局安装
   1. yarn add styled-components
2. 使用
   1. 引入的样式文件不再事css文件，都改成js文件，但是引入方法还是css的引入方法。
   2. 在样式文件中引入：
      1. import { createGlobalStyle } from 'styled-components';
   3. 全局样式添加样式都导出：
      1. 搜索全局样式文件reset.css，然后复制里面的内容添加到下面

      2. export const Globalstyle = createGlobalStyle`　

         body {

         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;

         }}`