fixed #823

examples/routers/menu.vue

@@ -36,13 +36,15 @@
             <Radio label="dark"></Radio>
             <Radio label="primary"></Radio>
         </Radio-group>
+        <Input v-model="value4" icon="ios-clock-outline" placeholder="请输入..." style="width: 200px"></Input>
     </div>
 </template>
 <script>
     export default {
         data () {
             return {
-                theme1: 'light'
+                theme1: 'light',
+                value4: ''
             }
         }
     }

src/styles/components/menu.less

@@ -10,6 +10,7 @@
     color: @text-color;
     font-size: @font-size-base;
     position: relative;
+    z-index: @zindex-select;
 
     &-horizontal{
         height: 60px;