element 的菜单导航报错问题

vue.esm.js?f912:628 [Vue warn]: Invalid prop: type check failed for prop "index". Expected String with value "0", got Number with value 0.

found in

---> <ElSubmenu> at packages/menu/src/submenu.vue
       <ElMenu> at packages/menu/src/menu.vue
         <ElAside> at packages/aside/src/main.vue
           <ElContainer> at packages/container/src/main.vue... (1 recursive calls)
             <Index> at src/views/index.vue
               <App> at src/App.vue
                 <Root>

number类型转换成string类型接好了

解决前的代码    

解决后的代码