<Bang ref="Bang" @changBang="changBang" v-show="selected=='电子导检' && istoKen"></Bang>
<div>
<Daoinfo v-show="selected=='电子导检' && !istoKen" ref="child1"></Daoinfo>
</div>
if (sessionStorage.getItem('ele_login')) {
this.istoKen = false
} else {
this.istoKen = true
}