VUE2.X 使用lib-flexible px2rem-loader 实现1920*1080下的等比缩小

效果

先用脚手架安装基础框架 并实现一个水平居中的效果 如下图所示

结构目录如下

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;
}

demo.vue

<template>

  <div class="demo">
    <div class="bigBox">
      <div class="smallBox"></div>
    </div>
  </div>

</template>

<script >

</script>

<style>

  .demo{
    height:100vh;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .bigBox{
    width:400px;
    height:400px;
    background:pink;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .bigBox>.smallBox{
    width:200px;
    height:200px;
    background:blue;
  }

</style>

现在拖动屏幕是没效果的 应该是这样

安装 lib-flexible(px转换成rem)

npm install lib-flexible --save-dev

引入 lib-flexible

在main.js中引入lib-flexible

import 'lib-flexible'
import '@/assets/css/reset.css' 

接下来会看着这个问题

注:html的font-size为 宽度/10 即正常

手机端的font-size是正常的

pc端的font-size始终不正确

找到源码

打开./node_modules/lib-flexible/flexible.js，找到如下片段源码：

function refreshRem(){
    var width = docEl.getBoundingClientRect().width;
    if (width / dpr > 540) {
        width = 540 * dpr;
    }
    var rem = width / 10;
    docEl.style.fontSize = rem + 'px';
    flexible.rem = win.rem = rem;
}

修改源码

 function refreshRem(){
        var width = docEl.getBoundingClientRect().width;
        if (width / dpr > 1920) {
            width = 1920 * dpr;
        }
        var rem = width / 10;
        docEl.style.fontSize = rem + 'px';
        flexible.rem = win.rem = rem;
    }

现在pc端应该是正常的

安装 px2rem-loader

npm install px2rem-loader --save-dev

配置 px2rem-loader

1.在build/utils.js中，找到exports.cssLoaders，作出如下修改：

  exports.cssLoaders = function (options) {
      
      options = options || {}
      
      const px2remLoader = {
        loader: 'px2rem-loader',
        options: {
          remUint: 192
        }
      }
  
  ....

2.继续找到generateLoaders中的loaders配置，作出如下配置：

 // const loaders = options.usePostCSS ? [cssLoader, postcssLoader] : [cssLoader]
    const loaders = [cssLoader, px2remLoader]

运行项目 ... 新的bug来了 元素变得超级大

继续修改源码

目录:node_modules/px2rem/lib/px2rem.js

修改为

var defaultConfig = {
  baseDpr: 1,             // base device pixel ratio (default: 2)
  remUnit: 192,            // rem unit value (default: 75)
  remPrecision: 6,        // rem value precision (default: 6)
  forcePxComment: 'px',   // force px comment (default: `px`)
  keepComment: 'no'       // no transform value comment (default: `no`)
};

重启！ 正常啦