升级element-ui，修复菜单展开收缩bug！

package.json

    "babel-plugin-syntax-jsx": "^6.18.0",
    "babel-plugin-transform-vue-jsx": "^3.5.1",
    "babel-polyfill": "6.26.0",
    "element-ui": "2.0.7",
    "element-ui": "2.1.0",
    "vue": "2.5.2",
    "vue-cookie": "1.1.4",
    "vue-router": "3.0.1",

src/views/layout/sidebar.vue

<template>
  <aside class="site-sidebar">
    <div class="site-sidebar__inner">
      <!--  -->
      <el-menu
        ref="menuNav"
        :default-active="menuNavActive"
        :default-openeds="menuNavOpeneds"
        :collapse="$store.state.sidebarCollapse"
        class="site-sidebar__menu"
        background-color="#545c64"
  export default {
    data () {
      return {
        menuNavActive: '1-1',
        menuNavOpeneds: ['1']
        menuNavActive: '1-1'
      }
    },
    components: {
      SubMenuNav
    },
    watch: {
      $route: 'routeHandle',
      '$store.state.sidebarCollapse': function (val) {
        if (!val) {
          this.$refs.menuNav.open(this.menuNavOpeneds[0])
        }
      }
      $route: 'routeHandle'
    },
    created () {
      this.routeHandle(this.$route, true)