umi移动端适配

1、 安装postcss-px-to-viewport

yarn add postcss-px-to-viewport -S

2、在umirc中引入postcss-px-to-viewport这个模块

import postCssPxToViewport from "postcss-px-to-viewport"

extraPostCSSPlugins: [

    postCssPxToViewport({

    viewportWidth: 375

})],