index.vue
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<template>
  <div class="sidebar-container fixed-sidebar">
    <el-scrollbar wrap-class="scrollbar-wrapper">
      <el-menu
        default-active="2"
        class="el-menu-vertical-demo"
        :background-color="variables.menuBg"
        :text-color="variables.menuText"
        :active-text-color="variables.menuActiveText"
        @open="handleOpen"
        @close="handleClose"
      >
        <el-submenu index="1">
          <template slot="title">
            <i class="el-icon-location"></i>
            <span>导航一</span>
          </template>
          <el-menu-item-group>
            <template slot="title">分组一</template>
            <el-menu-item index="1-1">选项1</el-menu-item>
            <el-menu-item index="1-2">选项2</el-menu-item>
          </el-menu-item-group>
          <el-menu-item-group title="分组2">
            <el-menu-item index="1-3">选项3</el-menu-item>
          </el-menu-item-group>
          <el-submenu index="1-4">
            <template slot="title">选项4</template>
            <el-menu-item index="1-4-1">选项1</el-menu-item>
          </el-submenu>
        </el-submenu>
        <el-menu-item index="2">
          <i class="el-icon-menu"></i>
          <span slot="title">导航二</span>
        </el-menu-item>
        <el-menu-item index="3">
          <i class="el-icon-document"></i>
          <span slot="title">导航三</span>
        </el-menu-item>
        <el-menu-item index="4">
          <i class="el-icon-setting"></i>
          <span slot="title">导航四</span>
        </el-menu-item>
      </el-menu>
    </el-scrollbar>
  </div>
</template>
<script>
import variables from '@/styles/variables.scss'
export default {
  name: 'Sidebar',
  computed: {
    variables() {
      return variables
    }
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath)
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath)
    }
  }
}
</script>
<style lang="scss" scoped>
@import '~@/styles/mixin.scss';
@import '~@/styles/variables.scss';
.sidebar-container {
  width: $sidebarWidth;
  &.fixed-sidebar {
    position: fixed;
    top: 60px;
  }
  .el-menu-vertical-demo {
    height: 100vh;
    overflow: hidden;
  }
}
</style>