封装locaostorage

 const ls = localStorage

 export default {
   setItem(name, value) {
     ls.setItem(name, JSON.stringify(value))
   },
   getItem(name) {
     try {
       return JSON.parse(ls.getItem(name))
     } catch (e) {
       return null
     }
   },
   removeItem(name) {
     ls.removeItem(name)
   }
 }