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vue 使用localstorage實(shí)現(xiàn)面包屑的操作

更新時(shí)間：2020年11月16日 09:58:53 作者：Cassie、

這篇文章主要介紹了vue 使用localstorage實(shí)現(xiàn)面包屑的操作，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧

mutation.js代碼：

changeRoute(state, val) {
    let routeList = state.routeList;
    let isFind = false;
    let findeIdex = 0;

    //菜單欄和下拉的二級(jí)菜單
    if (val['type'] == 'header' || val['type'] == 'secondHeader')   {
      routeList.length = 0;
      //頂級(jí)菜單清除緩存
      localStorage.removeItem("routeList");
    }
    let routes = routeList;
    let localStorageList = localStorage.getItem('routeList');
    if (localStorageList) {
      //當(dāng)前頁(yè)刷新,使用緩存數(shù)據(jù)
      routes = JSON.parse(localStorageList as any);
    }
    //遍歷是否有存入當(dāng)前路由位置
    for (let i = 0; i < routes.length; i++) {
      isFind = routes[i]['name'] == val['name'];
      if (isFind) {
        findeIdex = i;
        break;
      }
    };
    if (isFind) {
      //有的話，清除當(dāng)前路由以后的數(shù)據(jù)
      routes.splice(findeIdex + 1, routes.length - findeIdex - 1);
      //修改緩存
      localStorage.setItem('routeList', JSON.stringify(routes));
    } else {
      //存入全局變量
      routes.push(val);
      //設(shè)置緩存
      localStorage.setItem('routeList', JSON.stringify(routes));
    }
  }

頁(yè)面使用：

//獲取面包屑緩存
  let localStorageList1 = localStorage.getItem('routeList');
  //ts寫(xiě)法 as any
  this.routeList = JSON.parse(localStorageList1 as any) 
   ? JSON.parse(localStorageList1 as any)
   : { name: 'test', url: '/test' };

知識(shí)點(diǎn)：

1、localstorage

2、JSON.stringify()的作用是將 JavaScript 值轉(zhuǎn)換為 JSON 字符串，JSON.parse()將JSON字符串轉(zhuǎn)為一個(gè)對(duì)象

補(bǔ)充知識(shí)：vue+elementUI動(dòng)態(tài)生成面包屑導(dǎo)航

項(xiàng)目需要?jiǎng)討B(tài)生成面包屑導(dǎo)航,并且首頁(yè)可以點(diǎn)擊.其余為路徑顯示

<el-menu :unique-opened="true" router :default-active="$route.path" @select="handleSelect">
    <div class="user-menu-box" v-for="menu in menus" :key="menu.id">
      <el-menu-item v-if="!menu.child" :index="menu.path">
        <icon :name="menu.icon" :w="20" :h="20"></icon>
        <span slot="title" v-text="menu.name"></span>
      </el-menu-item>
      <el-submenu v-if="menu.child" :index="menu.path">
        <template slot="title">
          <icon :name="menu.icon" :w="20" :h="20"></icon>
          <span slot="title" v-text="menu.name"></span>
        </template>
        <el-menu-item-group>
          <el-menu-item v-for="subMenu in menu.child" :key="subMenu.id" v-text="subMenu.name"
            :index="subMenu.path"></el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </div>
</el-menu>

上面的代碼是elementUI組件的樣式,根據(jù)項(xiàng)目需要做了修改,搬運(yùn)的時(shí)候根據(jù)項(xiàng)目自己改改

export default {
  data () {
    return {
      activeMenu: '',
      indexBreadcrumbs: [],
      menus: [{
        id: '1',
        name: '門(mén)戶管理',
        icon: 'menhuguanli',
        path: '#2',
        child: [{
          id: '1-1',
          name: '輪播圖',
          path: '/backstage/protaManage/turns'
        }, {
          id: '1-2',
          name: '基礎(chǔ)數(shù)據(jù)',
          path: '/backstage/protaManage/basis'
        }, {
          id: '1-3',
          name: '分類管理',
          path: '/backstage/protaManage/classify'
        }, {
          id: '1-4',
          name: '內(nèi)容發(fā)布',
          path: '/backstage/protaManage/content'
        }]
      }, {
        id: '2',
        name: '我的云盤(pán)',
        icon: 'yunpan',
        path: '/backstage/yunManage'
      }, {
        id: '3',
        name: '管理菜單',
        icon: 'shezhi',
        path: '/backstage/menusManage'
      }, {
        id: '4',
        name: '編輯板塊',
        icon: 'fabuzhongxin',
        path: '/backstage/editPlate'
      }]
    }
  },
  watch: {
    $route () {
      this.handChange()
    }
  },
  computed: {
    breadcrumbList () {
      let breadcrumbs = []
      let menuList = this.menus
      this.indexBreadcrumbs.map(item => {
        for (let i = 0; i < menuList.length; i++) {
          if (item === menuList[i].path) {
            breadcrumbs.push(menuList[i])
            if (menuList[i].child) {
              menuList = menuList[i].child
            }
            break;
          }
        }
      })
      return breadcrumbs
    }
  },
  methods: {
    handChange () {
      this.$emit('hand-change', this.breadcrumbList)
    },
    handleSelect (index, indexPath) {
      this.indexBreadcrumbs = indexPath
    }
  },
  created () {
    this.handChange()
  }
}

上面的代碼是模擬的數(shù)據(jù),調(diào)用elememtUI的組件導(dǎo)航菜單的中的@select方法,有兩個(gè)參數(shù),可以自行打印

然后在computed中計(jì)算當(dāng)前選中的是哪一部分,取到返回值,然后$emit傳給父組件,

<el-breadcrumb separator-class="el-icon-arrow-right">
   <el-breadcrumb-item :to="{ path: '/backstage' }">首頁(yè)</el-breadcrumb-item>
   <el-breadcrumb-item v-for="o in breadcrumbList" :key="o.id">{{o.name}}
   </el-breadcrumb-item>
 </el-breadcrumb>

父組件中取到子組件傳過(guò)來(lái)的值后,直接渲染就行了

以上這篇vue 使用localstorage實(shí)現(xiàn)面包屑的操作就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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