解决element-ui的下拉框有值却无法选中的情况

// this.$forceUpdate() 
<el-select
   v-model="filters.series_id"
   filterable
   placeholder="请选择"
   clearable
   @change="$forceUpdate()"
>
   <el-option
     style="width: 450px"
     :title="item.title"
     v-for="item in series_ids"
     :key="item.title"
     :label="item.title"
     :value="item.title"
    ></el-option>
</el-select>