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