ps切图测量编写的css代码与网页显示不同的问题解决

/**
       * 动态更改全局页面缩放，防止切图与显示不同
       */
       window.onresize = function(e){
        detectZoom();
      }
      function detectZoom() {
          var 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;
          document.querySelector("html").style.fontSize = (16 / (ratio / 100)) + "px";
      }