使用iview時控制檯遇到的告警資訊：
: component lists rendered with v-for should have explicit keys. See https://vuejs.org/guide/list.html#key for more info.
@ ./src/components/VideoManage/StickersNew.vue 7:0-374
原本的程式碼如下：

  <Col span="2">
  <Select placeholder="請選擇國家" v-model="area">
    <Option v-for="(area, key) in areaCountry" :value="key">{{ area.desc }}</Option>
  </Select>
  </Col>
 

執行時顯示warning，新增：key即可，如下

  <Col span="2">
  <Select placeholder="請選擇國家" v-model="area">
    <Option v-for="(area, key) in areaCountry" :value="key" :key="area.desc">{{ area.desc }}</Option>
  </Select>
  </Col>