ant-design-vue/components/badge/demo/change.md

#### 动态 展示动态变化的效果。 #### Dynamic The count will be animated as it changes.

<template>
  <div>
    <div>
      <a-badge :count="count">
        <a href="#" class="head-example" />
      </a-badge>
      <a-button-group>
        <a-button @click="decline">
          <a-icon type="minus" />
        </a-button>
        <a-button @click="increase">
          <a-icon type="plus" />
        </a-button>
      </a-button-group>
    </div>
    <div style="margin-top: 10px">
      <a-badge :dot="show">
        <a href="#" class="head-example" />
      </a-badge>
      <a-switch v-model="show" />
    </div>
  </div>
</template>
<script>
export default {
  data(){
    return {
      count: 5,
      show: true,
    }
  },
  methods: {
    decline () {
      let count = this.count - 1
      if (count < 0) {
        count = 0
      }
      this.count = count
    },
    increase () {
      this.count++
    },
  }
}
</script>