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在此输入正文

选择完下拉框后，后面的输入框自动获取焦点

<el-select size="mini" filterable remote default-first-option placeholder=""
    placeholder="八位数字"
    v-model="detailInfo.params.order_num"
    :remote-method="queryOrder"
    @change="orderNumChange"
    :loading="loading"
    ref="order_num">
    <el-option
      v-for="item in orders"
      :key="item.value"
      :label="item.label"
      :value="item.value">
    </el-option>
 </el-select>
 // 需要根据不同情况判断具体哪个输入框获取焦点,之前下拉框change时触发的时间需要保留
 orderNumChange() {
    this.getOrderNo()
    this.orderType === 0 ? 
    this.$refs['departure'].focus() :                                                this.$refs['transport_mode'].focus()
  }