thing_web/public/scada/plugins/monitorZoom.js

(function (){
  var monitorZoom = () => {
    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;
  };

  var m = monitorZoom();
  if (window.screen.width * window.devicePixelRatio >= 3840) {
    document.body.style.zoom = 100 / (Number(m) / 2); // 屏幕为 4k 时
  } else {
    document.body.style.zoom = 100 / Number(m);
  }
})()