[Improvement] support Number type info (#845)

packages/badge/index.vue

@@ -1,19 +1,20 @@
 <template>
   <a class="van-badge van-hairline" :class="{ 'van-badge--select': isSelect }" :href="url" @click="onClick">
-    <div v-if="info" class="van-badge__info">{{ info }}</div>
+    <div v-if="isDef(info)" class="van-badge__info">{{ info }}</div>
     {{ title }}
   </a>
 </template>
 
 <script>
 import create from '../utils/create';
+import { isDef } from '../utils';
 
 export default create({
   name: 'badge',
 
   props: {
     url: String,
-    info: String,
+    info: [String, Number],
     title: String
   },
 
@@ -28,6 +29,8 @@ export default create({
   },
 
   methods: {
+    isDef,
+
     onClick() {
       this.$emit('click', this.$parent.badges.indexOf(this));
     }