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vue cli3，根据屏幕大小适配样式
最近做了一个大屏，考虑到要在不同的显示器上，显示同一套代码，所以我就想到了，阿里的“lib-flexible”，
干货非常多，千万不要错过细节哦，废话不说，直接干
1.安装需要响应的包
npm i lib-flexible -S
这个包会有改动的东西，先卖个关子，最后会详细说。
（2）安装第二个包
npm i px2rem-loader -D
2.安装好了之后全局引入包，在main.js中添加如下代码
import 'lib-flexible'
3.在vue.config.js中添加如下代码
css: { loaderOptions: { postcss: { plugins: [ require('postcss-px2rem')({
remUnit: 192 }) ] } }, },
值得注意的是remUnit，这个是填你们的设计稿的大小除以2，再除以10，不过这个要注意一点，当你改完lib-flexible时，你就需要填写除以设计稿的10就可以了。
4.修改lib-flexible.js，
为什么要改，你会发现一个问题，移动端没问题，但是pc端他的大小只适配到540，
所以在安装包里找到 lib-flexible，包中的lib-flexible.js文件，
其中修改如下代码
没改之前
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; }
修改之后
function refreshRem(){ var width = docEl.getBoundingClientRect().width; if
(width / dpr > 540) { width = width * dpr; } var rem = width / 10;
docEl.style.fontSize = rem + 'px'; flexible.rem = win.rem = rem; }
就是把540的宽度改成，当前屏幕的宽度
5.改完之后如何在项目中同步更新呢？
接下来把这个文件复制出来，放到lib文件下
然后在main.js中
把import 'lib-flexible'改成import './lib/lib-flexible',
这样就可以在所有项目同步了，不用每个人都改了。
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