处理个人帐套只有一个时，不能与个人切换的bug

components/default/Header.vue

@@ -17,7 +17,7 @@
               <ul class="dropdown-menu">
                 <li class="menu-item-first">
                   <span><i class="fa fa-map-marker"></i>&nbsp;{{ enterprise.enName }}</span>
-                  <a class="pull-right" @click="toggleEnterprises()" v-if="user.data.enterprises && user.data.enterprises.length > 1">
+                  <a class="pull-right" @click="toggleEnterprises()" v-if="user.data.enterprises && user.data.enterprises.length > 0">
                     {{ showEnterprises ? '取消' : '切换' }}
                   </a>
                 </li>