Vue子组件监听父页面传来的值

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
            }
          
        },
}