多选和默认
<a-form-item label="选择仓库" :labelCol="labelCol" :wrapperCol="wrapperCol">
          <a-select v-decorator="['WarehouseId', { rules: [{ required: true ,message:'请选择'}],initialValue: warhousecollection[0].Id }]">
            <a-select-option v-for="d in warhousecollection" :key="d.Id" :value="d.Id">{{d.Warehouse}}</a-select-option>
          </a-select>
</a-form-item>


  mounted() {
    this.loading = true
    this.$http.get('/BaseWarehouse/T_Warehouse/GetDataListAll').then(resJson => {
      this.loading = false

      if (resJson.Success) {
        //this.$message.success('操作成功!')
          this.warhousecollection=resJson.Data
          // this.form.setFieldsValue({
          //   "WarehouseId": this.warhousecollection[0],
          // })
      } else {
        this.$message.error(resJson.Msg)
        this.warhousecollection = null
      }
    })
  }