方式一：

    openNewWindow() {
      const { href } = this.$router.resolve({
        path: "/preview",
      });
      window.open(href, "_blank", "width=900, height=700");
    },

 方式二：

            <router-link target="_blank" :to="{ path: '/open' }">
              打开新窗口
            </router-link>