vue2.0 element-ui中的el-select选择器无法显示选中的内容

我使用的是element-ui V2.2.3。代码如下，当我选择值得时候，el-select选择器无法显示选中的内容，但是能触发change方法，并且能输出选择的值。

select.vue文件

<template>
    <div>
        <div class="row" v-for="RowItem in rows">
            <div class="col" v-for="colItem in RowItem.configVos">
               <el-select v-model="formData[colItem.paramCode]" :class="getModel(colItem.paramCode)"    @change="onSelectChange(colItem.paramCode,formData[colItem.paramCode])">
                    <el-option v-for="option in colItem.configOptions" :label="option.optionCode"
                        :value="option.optionValue" >
                    </el-option>
		</el-select>
            </div>
        </div>
    </div>
</template>

<script>
    import axios from 'axios';
    export default {
        data() {
            return {
               groupItem:{},
               formData:{},
               rows:'',
               cols:''
            }
        },
        watch:{

        },
        methods:{
            getfordata:function(){
               var _this = this;
               axios.get('../json/selectdata.json')
               .then(function(res){
                  _this.groupItem = res.data;
                   var row = _this.groupItem[0].rowData;
                  _this.rows = row;
                  for(var i=0;i<row.length;i++){
                      var col = row[i].configVos;
                      for(var j=0;j<col.length;j++){
                          var key = col[j];
                             _this.formData[key.paramCode] = '';             

                      }
                  }
               })

            },
            onSelectChange:function(key,val){
               console.log(val);
            },
            getModel(model) {
                console.log(model);
            }
        },
        created:function(){
            this.getfordata();
        }
    }
</script>

<style scoped>
 .col{
     float:left;
 }
 .row{
     width:800px;
     height:100px;
 }
</style>

selectdata.json文件

[
  {
    "groupName": "抽数转换",
    "rowData": [
      {
        "configVos": [
          {
            "configOptions": [
              {
                "id": "D",
                "optionCode": "否",
                "optionValue": "0",
                "paramId": "4"
              },
              {
                "id": "5",
                "optionCode": "是",
                "optionValue": "1",
                "paramId": "4"
              }
            ],
            "id": "4E",
            "paramCode": "isView",
            "paramValue": "0"
          },
          {
            "configOptions": [
              {
                "id": "4",
                "optionCode": "老版本",
                "optionValue": "0",
                "paramId": "4"
              },
              {
                "id": "4",
                "optionCode": "新版本",
                "optionValue": "1",
                "paramId": "44"
              }
            ],
            "id": "24",
            "paramCode": "isDeleteCbnd",
            "paramValue": "1"
          }
        ]
      },
      {
        "configVos": [
          {
            "configOptions": [
              {
                "id": "EF",
                "optionCode": "估值2.5",
                "optionValue": "0",
                "paramId": "1"
              },
              {
                "id": "8B",
                "optionCode": "估值2.5+qd",
                "optionValue": "1",
                "paramId": "131"
              },
              {
                "id": "06",
                "optionCode": "恒生2.5",
                "optionValue": "2",
                "paramId": "1"
              },
              {
                "id": "25BF",
                "optionCode": "估值4.5",
                "optionValue": "3",
                "paramId": "31"
              }
            ],
            "id": "31",
            "paramCode": "converType",
            "paramValue": "0"
          },
          {
            "configOptions": [
              {
                "id": "1366",
                "optionCode": "万德",
                "optionValue": "0",
                "paramId": "98"
              },
              {
                "id": "EC",
                "optionCode": "聚源",
                "optionValue": "1",
                "paramId": "8"
              }
            ],
            "id": "91F8",
            "paramCode": "zxDataSource",
            "paramValue": "0"
          }
        ]
      },
      {
        "configVos": [
          {
            "configOptions": [
              {
                "id": "CD",
                "optionCode": "期货占用",
                "optionValue": "HS",
                "paramId": "5C"
              },
              {
                "id": "91508011",
                "optionCode": "其它",
                "optionValue": "YYS",
                "paramId": "91C"
              }
            ],
            "id": "5C",
            "paramCode": "derivativeDataSource",
            "paramValue": "HS"
          }
        ]
      }
    ]
  }
]

后来去看了Vue文档，发现文档中有说

我只是把下面绿色那句改成上面红色这句，就好了

所以还是要好好看文档！！！

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