[Improvement] support Number type info (#845)

packages/icon/index.vue

@@ -1,11 +1,12 @@
 <template>
   <i class="van-icon" :class="`van-icon-${name}`" v-on="$listeners">
     <slot />
-    <div v-if="info" class="van-icon__info">{{ info }}</div>
+    <div v-if="isDef(info)" class="van-icon__info">{{ info }}</div>
   </i>
 </template>
 
 <script>
+import { isDef } from '../utils';
 import create from '../utils/create-basic';
 
 export default create({
@@ -13,7 +14,11 @@ export default create({
 
   props: {
     name: String,
-    info: String
+    info: [String, Number]
+  },
+
+  methods: {
+    isDef
   }
 });
 </script>