vue2.0 element-ui中el-select选择器无法显示选中的内容(解决方法)

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

总结

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