vue循环绑定v-model

<repayInput v-if="formData" v-for="(item, index) in formData"
:isPwd="item.parameter_code==='password'"
:text="item.parameter_name.replace('社保网站','')"
:textAlign="'right'"
:errText="arrForm[index][`arr${item.parameter_code}`]"
@changeErrText="_changeErrText2($event,index,'arr'+item.parameter_code)"
:type="item.parameter_code"
:maxlength="item.parameter_code==='name'?'15':'50'"
:placeholder="item.parameter_message"
v-model="arrForm[index][item.parameter_code]" :key="index">
</repayInput>

_this.arrForm.length = 0;
// debugger
let obj = _this.formInfo[_this.socialType.value].tabs[selectedVal[selectedVal.length-1]].field;
for(var j=0; j<obj.length; j++) {
var strObj = `{"${obj[j].parameter_code}":"","arr${obj[j].parameter_code}":"","type":"${obj[j].parameter_code}","name${obj[j].parameter_code}":"${obj[j].parameter_name}"}`;
// Vue.set(_this.arrForm, obj[j].parameter_code, '');
// Vue.set(_this.arrForm, `arr${obj[j].parameter_code}`,'');
_this.arrForm.push(JSON.parse(strObj))
}

//验证动态表单 this.arrForm
let _this = this;
for(var i=0; i< _this.arrForm.length; i++) {
var cur = _this.arrForm[i];
if( !rValidate.isEmpty(cur[cur.type],() => {
cur['arr'+cur.type] = cur['name'+cur.type] + '不能为空';
}) ){
dyPro = false;
}
if( cur.type === 'id_card_num' ){
if( cur[cur.type]!==_this.query.cardNo ) {//验证是否与借款人是同一人
cur['arr'+cur.type] = '请输入身份认证时身份证账号';
dyPro = false;
}
}
if( cur.type === 'cell_phone_num' ){
if( !rValidate.mobile(cur[cur.type],() => {
cur['arr'+cur.type] = '手机号码格式错误';
}) ) {
dyPro = false;
}
}
}

//组织表单参数 applyInfo _this.arrForm
let applyInfo = {};
for(var i=0; i< _this.arrForm.length; i++) {
var cur = _this.arrForm[i];
applyInfo[cur.type] = cur[cur.type];
}
query_.applyInfo = applyInfo;