Vue子組件監聽父頁面傳來的值

export default { name: "areaCascade", props: { formItem: { type: Object, required: true }, }， watch:{ formItem:{ handler() { this.formItem.templateList[this.order].value = this.formItem.templateList[this.order].busiRegCityName +'/'+this.formItem.templateList[this.order].busiRegCountyName+this.formItem.templateList[this.order].busiRegGridName }, deep: true }  },
}