一切交给路由router

一 、层级导航布局

element 默认展开子菜单，刷新路由展开子菜单，子菜单自动高亮

默认展开的组： default-openeds属性控制 === 值为数组defaultMenu包含所有的submenu 的index值

默认高亮的子菜单有属性active控制， active: currentMenu === menu.linkName

<template>
  <div class="nav-menu">
    <el-menu
      :default-openeds="defaultMenu"
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
      :unique-opened="true"
    >
      <el-submenu
        :index="nav.title"
        v-for="(nav, index) in group"
        :key="index"
        class="title"
        :class="{ active: currentTitle === nav.title }"
        @click="goHome(nav)"
      >
        <template slot="title">{{ nav.title }}</template>
        <el-menu-item
          :index="menu.linkName"
          v-for="(menu, idx) in nav.menus"
          class="menu"
          :class="{ active: currentMenu === menu.linkName }"
          @click="setActive(nav.title, menu)"
          :key="idx"
          >{{ menu.tabName }}</el-menu-item
        >
      </el-submenu>
    </el-menu>
  </div>
</template>

<script>
export default {
  components: {},
  data() {
    return {
      currentTitle: '',
      currentMenu: '',
      group: [],
      defaultMenu: [this.$t('header.myMarathon')]
    }
  },
  watch: {
    '$i18n.locale'() {
      this.setGroup()
      this.$emit('update', this.currentMenu)
    },
    $route() {
      this.initActivedTab()
    }
  },
  computed: {},
  created() {
    this.setGroup()
    this.initActivedTab()
  },
  mounted() {
    this.initActivedTab()
  },
  methods: {
    handleOpen(e) {
      console.log(e)
      if (e === this.$t('header.myMarathon')) {
        this.currentMenu = ''
        this.$router.push({ name: 'owner' })
      }
    },
    handleClose() {},
    setActive(title, menu) {
      this.currentTitle = title
      this.currentMenu = menu.linkName
      this.$emit('update', menu)
      this.$router.push({ name: menu.linkName })
    },
    setGroup() {
      this.group = [
        {
          title: this.$t('header.myMarathon')
        },
        {
          title: this.$t('user.game'),
          menus: [
            { tabName: this.$t('user.apply'), linkName: 'userApply' },
            { tabName: this.$t('user.results'), linkName: 'results' },
            { tabName: this.$t('user.certificate'), linkName: 'certificate' },
            { tabName: this.$t('user.photo'), linkName: 'photo' }
          ]
        },
        {
          title: '我的志愿者',
          menus: [
            { tabName: '我的报名', linkName: 'motorApply' },
            { tabName: '我的证书', linkName: 'motorCert' },
            { tabName: '我的徽章', linkName: 'badge' },
            { tabName: '我的小组', linkName: 'group' },
            { tabName: '我的兑换', linkName: 'exchange' }
          ]
        },
        {
          title: this.$t('user.account'),
          menus: [
            { tabName: this.$t('user.info'), linkName: 'info' },
            { tabName: '我的消息', linkName: 'message' },
            { tabName: this.$t('user.offspring'), linkName: 'offspring' },
            { tabName: this.$t('user.integral'), linkName: 'integral' },
            { tabName: this.$t('user.safe'), linkName: 'safe' }
          ]
        }
      ]
    },
    goHome(nav) {
      // this.currentTitle = nav.title
      // if (nav.title === this.$t('header.myMarathon')) {
      //   this.currentMenu = ''
      //   this.$router.push({ name: 'owner' })
      // } else {
      //   this.currentMenu = nav.menus[0].tabName
      //   this.$router.push({ name: nav.menus[0].linkName })
      // }
    },
    initActivedTab() {
      if (this.$route.name === 'owner') {
        this.currentTitle = this.$t('header.myMarathon')
        this.currentMenu = ''
      } else {
        this.group.some(el => {
          if (el.menus) {
            let res = el.menus.find(item => item.linkName === this.$route.name)
            if (res) {
              this.defaultMenu = [el.title]
              this.currentTitle = el.title
              this.currentMenu = res.linkName
              return true
            }
          }
        })
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.nav-menu {
  width: 264px;
  background: #ffffff;
  border-radius: 3px;
  padding: 0 17px 17px;
  font-size: 18px;
  overflow: hidden;
  color: #4a4a4a;
  /deep/ .title.active {
    background: #fff !important;
  }
  /deep/ .el-submenu__title {
    line-height: 55px;
    color: #2c3e6e !important;
    font-size: 18px !important;
    margin-top: 17px;
    cursor: pointer;
    &:hover {
      background: #fff;
    }
  }
  .el-submenu .el-menu-item {
    line-height: 55px;
    font-size: 18px;
    padding-left: 15px;
    margin-top: 17px;
    &:hover {
      background: #fff;
    }
  }
  .el-menu-item.active {
    color: #d7a746;
    background-color: #fff;
  }
  .el-menu-item {
    color: #000;
    background-color: #fff;
  }

  .title {
    line-height: 55px;
    color: #2c3e6e;
    padding-left: 15px;
    margin-top: 17px;

    cursor: pointer;
    &.active {
      background: #f4f4f4;
      position: relative;
      &::before {
        content: '';
        width: 2px;
        height: 55px;
        background: #2c3e6e;
        position: absolute;
        left: -17px;
        top: 0;
      }
    }
  }
  .muens {
    list-style: none;
    margin-top: 13px;
    .menu {
      line-height: 50px;
      padding-left: 20px;
      width: 229px;
      cursor: pointer;
      &.active {
        color: #d7a746;
      }
    }
  }
}
</style>

二、平铺布局 将上面的代码中 html 局部替换即可

   <div v-for="(nav, index) in group" :key="index">
      <p class="title" :class="{ active: currentTitle === nav.title }" @click="goHome(nav)">
        {{ nav.title }}
      </p>
      <ul class="muens">
        <li
          class="menu"
          :class="{ active: currentMenu === menu.linkName }"
          v-for="(menu, idx) in nav.menus"
          :key="idx"
          @click="setActive(nav.title, menu)"
        >
          {{ menu.tabName }}
        </li>
      </ul>
    </div>

保留部分函数

   goHome(nav) {
      this.currentTitle = nav.title
      if (nav.title === this.$t('header.myMarathon')) {
        this.currentMenu = ''
        this.$router.push({ name: 'owner' })
      } else {
        this.currentMenu = nav.menus[0].tabName
        this.$router.push({ name: nav.menus[0].linkName })
      }
    },