vue项目中使用postcss-pxtorem

postcss-pxtorem

npm install postcss-pxtorem --save-dev

 配置文件

// https://github.com/michael-ciniawsky/postcss-load-config

module.exports = {
    "plugins": {
        "postcss-import": {},
        "postcss-url": {},
        // to edit target browsers: use "browserslist" field in package.json
        "autoprefixer": {
            browsers: ['Android >= 4.0', 'iOS >= 7']
        },
        "postcss-pxtorem": {
            viewportWidth: 1920, // (Number) The width of the viewport.
            viewportHeight: 1024, // (Number) The height of the viewport.
            unitPrecision: 3, // (Number) The decimal numbers to allow the REM units to grow to.
            viewportUnit: 'rem', // (String) Expected units.
            selectorBlackList: [], // (Array) The selectors to ignore and leave as px.
            minPixelValue: 1, // (Number) Set the minimum pixel value to replace.
            mediaQuery: false, // (Boolean) Allow px to be converted in media queries.
            propList: ['*']
        }
    }
}

//rem
(function () {
  let orientation = window.matchMedia("(orientation: portrait)");
  let width = document.documentElement.getBoundingClientRect().width; //获取宽度
  function onMatchMeidaChange(orientation) {
    if (orientation.matches) {
      // 竖屏
      width = document.documentElement.getBoundingClientRect().width; //获取竖屏宽度
      setTimeout(() => {
        // 重新计算竖屏宽度rem
        autoRootFontSize()
      });
    } else {
      // 横屏
      width = document.documentElement.getBoundingClientRect().width; //获取横屏宽度
      setTimeout(() => {
        // 重新计算横屏宽度rem
        autoRootFontSize()
      });
    }
  }
  onMatchMeidaChange(orientation);
  orientation.addListener(onMatchMeidaChange);

  /* 计算rem */
  function autoRootFontSize() {
    //(当前屏幕宽度，最小宽度为1200)/1920*16px
    let setSize = Math.max(document.documentElement.getBoundingClientRect().width,1200) / 1920 * 16;  
    //字体默认最大值为16px
    document.documentElement.style.fontSize = (setSize > 16 ? 16 : setSize) + 'px';
  }
  window.addEventListener('resize', autoRootFontSize);
  autoRootFontSize();
})();

在App.vue引入：

import "@/assets/js/public/rem.js";

如果不想转换元素单位可以把px改为Px或者PX。

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上面是vue-cli2+vue2的安装和配置方式

那么vue-cli3+vue3中的使用是有区别的：

1、安装一样：

npm install postcss-pxtorem --save-dev

2、配置：

1、在根目录添加文件：postcss.config.js

module.exports = {
  plugins: {
    'autoprefixer': {
      browsers: ['Android >= 4.0', 'iOS >= 7']
    },
    'postcss-pxtorem': {
      rootValue: 16,//结果为：设计稿元素尺寸/16，比如元素宽320px,最终页面会换算成 20rem
      propList: ['*']
    }
  }
}

2、在src/assets/js/下添加rem.js【内容同上面的版本】，然后在App.vue中引入： import "@/assets/js/rem.js";

3、重启看是否生效即可