之前这样写不行<el-menu
mode="vertical"
theme="dark"
ref="navbar"
:default-active="$route.path"
:default-openeds="newRouter"
unique-opened
router
@select="selectMenu">
<nav-item
v-for="(item,n) in treeData"
:item="item"
:navIndex="String(n)"
:key="item.id">
</nav-item>
</el-menu>
1.把router改为 :router="true"
原文：https://www.cnblogs.com/lizhao123/p/10875881.html