rem配置

1、新建一个vue项目，自行选择

vue create ***

2、安装rem

yarn add lib-flexible postcss-pxtorem

3、配置postcss.config.js文件

module.exports = {
  plugins: {
    autoprefixer: {},
    'postcss-pxtorem': {
      rootValue: 37.5,
      propList: ['*']
    }
  }
}

public/index.html
注释这一行（最新版本不需要注释掉这行）
<!-- <meta name="viewport" content="width=device-width,initial-scale=1.0"> -->

4、在main.js中引入

import 'lib-flexible/flexible'

5、rem是为移动端而生的要在pc和ipad上跑,一定要在App.vue文件中加

<template>
  <div id="app">
    <router-view></router-view>
  </div>
</template>
<style lang="less">
  #app {
    width:10rem;
    height: 100px;
    margin-left:auto;
    margin-right:auto;
    background-color: pink;
  }
</style>

6、引入reset.css样式重置

import '@/assets/css/reset.css'
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;
}