VUE项目中使用this.$forceUpdate()；解决页面v-for中修改item属性值后页面不改变的问题

<el-select :popper-append-to-body="false" popper-class="dropdown" class="screen-select" style="background: none !important;" @change="selectAllCity" size="small" clearable v-model="fromdata.city" placeholder="请选择">
  <el-option
    style="background: none !important;"
    v-for="item in cityChoice"
    :key="item.value"
    :label="item.label"
    :value="item.value">
  </el-option>
</el-select>

selectAllCity () {
  this.$forceUpdate()
},