前端vue按1920*1080设计图的页面适配屏幕缩放并适配4K屏详解

export const detectZoom = () => {
  let ratio = 0,
    screen = window.screen,
    ua = navigator.userAgent.toLowerCase();
  if (window.devicePixelRatio !== undefined) {
    ratio = window.devicePixelRatio;
  } else if (~ua.indexOf('msie')) {
    if (screen.deviceXDPI && screen.logicalXDPI) {
      ratio = screen.deviceXDPI / screen.logicalXDPI;
    }
  } else if (
    window.outerWidth !== undefined &&
    window.innerWidth !== undefined
  ) {
    ratio = window.outerWidth / window.innerWidth;
  }
  if (ratio) {
    ratio = Math.round(ratio * 100);
  }
  return ratio;
};

import { detectZoom } from '@/utils/detectZoom.js';
const m = detectZoom();
document.body.style.zoom = 100 / Number(m);

import { detectZoom } from '@/utils/detectZoom.js';

const m = detectZoom();
 //判断屏幕是否为4k
if (window.screen.width * window.devicePixelRatio >=3840) {
  // switch (m) {
  //   // 4k屏时屏幕缩放比为100%
  //   case 100:
  //     document.body.style.zoom = 100 / 50;
  //     break;
  //     // 4k屏时屏幕缩放比为125%
  //   case 125:
  //     document.body.style.zoom = 100 / 62.5;
  //     break;
  //     // 4k屏时屏幕缩放比为150%
  //   case 150:
  //     document.body.style.zoom = 100 / 75;
  //     break;
  //     // 4k屏时屏幕缩放比为175%
  //   case 175:
  //     document.body.style.zoom = 100 / 87.4715;
  //     break;
  //     // 4k屏时屏幕缩放比为200%
  //   case 200:
  //     document.body.style.zoom = 100 / 100;
  //     break;
  //     // 4k屏时屏幕缩放比为225%
  //   case 225:
  //     document.body.style.zoom = 100 / 112.485;
  //     break;
  
  //   default:
  //     break;
  // }
  document.body.style.zoom = 100 / (Number(m)/2);
}else{
  document.body.style.zoom = 100 / Number(m);
}