使用iview时控制台遇到的告警信息：
: 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
原本的代码如下：

  <Col span="2">
  <Select placeholder="请选择国家" v-model="area">
    <Option v-for="(area, key) in areaCountry" :value="key">{{ area.desc }}</Option>
  </Select>
  </Col>

运行时显示warning，添加：key即可，如下

  <Col span="2">
  <Select placeholder="请选择国家" v-model="area">
    <Option v-for="(area, key) in areaCountry" :value="key" :key="area.desc">{{ area.desc }}</Option>
  </Select>
  </Col>