Vue project issues:
This problem is because
<el-submenu></el-submenu>The index attribute is missing in the tag, so you only need to add it
<el-submenu index=""></el-submenu>
problem solved! ! !
Vue project issues:
This problem is because
<el-submenu></el-submenu>The index attribute is missing in the tag, so you only need to add it
<el-submenu index=""></el-submenu>
problem solved! ! !