vue 使用localstorage实现面包屑的操作

mutation.js代码：

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

    //菜单栏和下拉的二级菜单
    if (val[\'type\'] == \'header\' || val[\'type\'] == \'secondHeader\')   {
      routeList.length = 0;
      //顶级菜单清除缓存
      localStorage.removeItem(\"routeList\");
    }
    let routes = routeList;
    let localStorageList = localStorage.getItem(\'routeList\');
    if (localStorageList) {
      //当前页刷新,使用缓存数据
      routes = JSON.parse(localStorageList as any);
    }
    //遍历是否有存入当前路由位置
    for (let i = 0; i < routes.length; i++) {
      isFind = routes[i][\'name\'] == val[\'name\'];
      if (isFind) {
        findeIdex = i;
        break;
      }
    };
    if (isFind) {
      //有的话，清除当前路由以后的数据
      routes.splice(findeIdex + 1, routes.length - findeIdex - 1);
      //修改缓存
      localStorage.setItem(\'routeList\', JSON.stringify(routes));
    } else {
      //存入全局变量
      routes.push(val);
      //设置缓存
      localStorage.setItem(\'routeList\', JSON.stringify(routes));
    }
  }

页面使用：

//获取面包屑缓存
  let localStorageList1 = localStorage.getItem(\'routeList\');
  //ts写法 as any
  this.routeList = JSON.parse(localStorageList1 as any) 
   ? JSON.parse(localStorageList1 as any)
   : { name: \'test\', url: \'/test\' };

知识点：

1、localstorage

2、JSON.stringify()的作用是将 JavaScript 值转换为 JSON 字符串，JSON.parse()将JSON字符串转为一个对象

补充知识：vue+elementUI动态生成面包屑导航

项目需要动态生成面包屑导航,并且首页可以点击.其余为路径显示

<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>

上面的代码是elementUI组件的样式,根据项目需要做了修改,搬运的时候根据项目自己改改

export default {
  data () {
    return {
      activeMenu: \'\',
      indexBreadcrumbs: [],
      menus: [{
        id: \'1\',
        name: \'门户管理\',
        icon: \'menhuguanli\',
        path: \'#2\',
        child: [{
          id: \'1-1\',
          name: \'轮播图\',
          path: \'/backstage/protaManage/turns\'
        }, {
          id: \'1-2\',
          name: \'基础数据\',
          path: \'/backstage/protaManage/basis\'
        }, {
          id: \'1-3\',
          name: \'分类管理\',
          path: \'/backstage/protaManage/classify\'
        }, {
          id: \'1-4\',
          name: \'内容发布\',
          path: \'/backstage/protaManage/content\'
        }]
      }, {
        id: \'2\',
        name: \'我的云盘\',
        icon: \'yunpan\',
        path: \'/backstage/yunManage\'
      }, {
        id: \'3\',
        name: \'管理菜单\',
        icon: \'shezhi\',
        path: \'/backstage/menusManage\'
      }, {
        id: \'4\',
        name: \'编辑板块\',
        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()
  }
}

上面的代码是模拟的数据,调用elememtUI的组件导航菜单的中的@select方法,有两个参数,可以自行打印

然后在computed中计算当前选中的是哪一部分,取到返回值,然后$emit传给父组件,

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

父组件中取到子组件传过来的值后,直接渲染就行了

以上这篇vue 使用localstorage实现面包屑的操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。