[Vue warn]: Failed to mount component: template or render function not defined.
getAccessNav 函数，只是处理了权限菜单，如果权限为admin，allNav值不变
但是list中的compone属性改变了，
下图，第一个列表是allNav，第二个是navList，注意区别，beforeCreate是null
下为报错
解决办法为，在遍历一遍navList，component属性重新赋值 Main组件
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