vue使用动态渲染v-model输入框无法输入内容

<el-date-picker v-model="schemeRulesForm[item.names[0]]" type="date" placeholder="选择日期"></el-date-picker>

data () {
    return {
      schemeRulesForm: null // form 表单数据
    }
},
methods: {
    // 获取表单 name 值
    getRulesFormKey () {
      let rulesForm = []
      for (let i = 0; i < rulesFormItems.length; i++) {
        // 日期做特殊处理
        if (rulesFormItems[i].type == ‘date‘) {
          // 设置日期默认值
          rulesForm[rulesFormItems[i].names[0]] = getDateToNumDay(rulesFormItems[i].toDate)
          rulesForm[rulesFormItems[i].names[1]] = getThatTime()
        }
      }
      this.schemeRulesForm = {...rulesForm}
    }
  }