【element-vue】 浮动导航element写法

1app.vue路由要判断 为什么判断 是因为登录页面不需要；

 watch: {
    $route: (to) => {
      if (to.path === "/login") {
        document.getElementById("main").style.display = "none";
      } else {
        document.getElementById("main").style.display = "block";
      }
    },
  },

2 写法

 <ul class="main-div-content" id="main-div-content">
      <el-tooltip
        popper-class="student-light-tooltip-el"
        effect="light"
        placement="left"
      >
        <div slot="content" @click="clickAsk" class="slot-style">我要咨询</div>
        <li><img src="./assets" /></li>
      </el-tooltip>
      <el-tooltip
        popper-class="student-light-tooltip-phone-el"
        effect="light&#