获取浏览器缩放比例

mounted() {
    this.$nextTick(() => {
      window.addEventListener("resize", () => { // 监听浏览器窗口大小改变
        // 浏览器变化执行动作
      });
    });
  },

// 方法
detectZoom() {
   let ratio = 0
   const screen = window.screen
   const 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
},

设置刷新页面后自动将浏览器缩放比例设置为80%

created() {
    window.onload = window.onresize = function() {
      document.body.style.zoom = 0.8;
    };
  }

注意：在App.vue中设置，刷新会闪一下屏