<!-- 大屏固定比例16：9自適應(yīng)   -->
<template>
    <div class="container">
      <div class="content" :style="getAspectRatioStyle">
        <!-- 數(shù)據(jù)展示內(nèi)容 -->
      </div>
    </div>
  </template>
  <script setup lang="ts">
  import { ref, onMounted, onBeforeUnmount, computed } from 'vue';
      const contentWidth = ref(0);
      const contentHeight = ref(0);
      const calculateAspectRatio = () => {
        const container = document.querySelector('.container');
        // const containerWidth = container.offsetWidth;
        const containerWidth: number = (<HTMLElement>container).offsetWidth;
        // const containerHeight = container.offsetHeight;
        const containerHeight: number = (<HTMLElement>container).offsetHeight;
        const aspectRatio = 16 / 9; // 16:9 比例
        const containerAspectRatio = containerWidth / containerHeight;
        if (containerAspectRatio > aspectRatio) {
          // 以高度為基準(zhǔn)，按比例計(jì)算寬度
          contentHeight.value = containerHeight;
          contentWidth.value = Math.floor(containerHeight * aspectRatio);
        } else {
          // 以寬度為基準(zhǔn)，按比例計(jì)算高度
          contentWidth.value = containerWidth;
          contentHeight.value = Math.floor(containerWidth / aspectRatio);
        }
        console.log('contentWidth',contentWidth.value)
        console.log('contentHeight',contentHeight.value)
      };
      onMounted(() => {
        calculateAspectRatio();
        window.addEventListener('resize', calculateAspectRatio);
      });
      onBeforeUnmount(() => {
        window.removeEventListener('resize', calculateAspectRatio);
      });
      const getAspectRatioStyle = computed(() => ({
        width: `${contentWidth.value}px`,
        height: `${contentHeight.value}px`,
        margin: 'auto',
        background: 'gray'
      }
    ));
  </script>
  <style>
  .container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .content {
    /* 根據(jù)計(jì)算得到的寬高樣式設(shè)置 */
  }
  </style>

<template>
<div class="login-container">
  <div class="login-main" ref="dataScreenRef"></div>
</div>
</template>
<script setup>
const dataScreenRef = ref(null);
const width = 1920;
const height = 1080;
// 根據(jù)瀏覽器大小推斷縮放比例
// 首先要確定設(shè)計(jì)稿尺寸，默認(rèn)是 1920 x 1080
// 分別計(jì)算瀏覽器和設(shè)計(jì)圖寬高比
// 如果瀏覽器的寬高比大于設(shè)計(jì)稿的寬高比，就取瀏覽器高度和設(shè)計(jì)稿高度之比
// 如果瀏覽器的寬高比小于設(shè)計(jì)稿的寬高比，就取瀏覽器寬度和設(shè)計(jì)稿寬度之比
const getScale = (w = width, h = height) => {
  let ww = window.innerWidth / w;
  let wh = window.innerHeight / h;
  return ww < wh ? ww : wh;
};
/* 瀏覽器監(jiān)聽(tīng) resize 事件 */
const resize = () => {
  if (dataScreenRef.value) {
    dataScreenRef.value.style.transform = `scale(${getScale()}) translate(-50%, -50%)`;
  }
};
onMounted(() => {
  // 初始化時(shí)為外層盒子加上縮放屬性，防止刷新界面時(shí)就已經(jīng)縮放
  if (dataScreenRef.value) {
    dataScreenRef.value.style.transform = `scale(${getScale()}) translate(-50%, -50%)`;
    dataScreenRef.value.style.width = `${width}px`;
    dataScreenRef.value.style.height = `${height}px`;
  }
  window.addEventListener("resize", resize);
});
</script>
<style scoped lang="scss">
.login-container {
  width: 100%;
  height: 100%;
  transform-origin: 0 0;
  position: relative;
}
.login-main {
  width: 100%;
  height: 100%;
  position: absolute;
}
</style>

npm install postcss-px2rem --save

// rem等比適配配置文件
// 基準(zhǔn)大小
const baseSize = 14
// 設(shè)置 rem 函數(shù)
function setRem () {
  // 當(dāng)前頁(yè)面寬度相對(duì)于 1920寬的縮放比例，可根據(jù)自己需要修改。
  const scale = document.documentElement.clientWidth / 1920
  // 設(shè)置頁(yè)面根節(jié)點(diǎn)字體大?。ā癕ath.min(scale, 2)” 指最高放大比例為2，可根據(jù)實(shí)際業(yè)務(wù)需求調(diào)整）
  document.documentElement.style.fontSize = baseSize * Math.min(scale, 2) + 'px'
}
// 初始化
setRem()
// 改變窗口大小時(shí)重新設(shè)置 `rem`
window.onresize = function () {
  setRem()
}

import './util/rem'

// 引入等比適配插件
const px2rem = require('postcss-px2rem')
// 配置基本大小
const postcss = px2rem({
  // 基準(zhǔn)大小 baseSize，需要和rem.js中相同
  // remUnit: 14 代表 1rem = 14px; 所以當(dāng)你一個(gè)14px值時(shí)，它會(huì)自動(dòng)轉(zhuǎn)成 (14px/14)rem
  remUnit: 14
})
// 使用等比適配插件
module.exports = {
  lintOnSave: true,
  css: {
    loaderOptions: {
      less: {
        javascriptEnabled: true,
      },
      postcss: {
        plugins: [
          postcss,
        ],
      },
    },
  },
}