vue中watch监听对象中某个属性的方法

'currentParams.selOrgId': {
    handler(newV, oldV) {
        console.log("watch", newV, oldV)
    },
    immediate: true
}

currentParams: {
    handler (newV, oldV) {
        console.log('watch深度监听：', newV, oldV);
    },
    deep: true
}

data(){
    return {
        currentParams: {
            selOrgId: '1'
        },
    }
}

<input v-model="currentParams.selOrgId" />
 
data(){
    return {
        currentParams: {
            selOrgId: '1',//声明不声明都可以触发watch
        },
    }
},
 
watch: {
    'currentParams.selOrgId': (newV, oldV) => {
        console.log("watch", newV, oldV)
    },
},

data(){
    return {
        currentParams: {
            
        },
    }
},
 
watch: {
    'currentParams.selOrgId': (newV, oldV) => {
        console.log("watch", newV, oldV)
    },
},
methods: {
    triggerWatch () {
        方法一、要监听的属性值（currentParams.selOrgId）不需要事先声明
        this.currentParams=Object.assign({}, this.currentParams, {selOrgId:                               
        "改变后的值"});
 
        方法二、要监听的属性值（currentParams.selOrgId）不需要事先声明
        this.$set(this.currentParams,'selOrgId',"改变后的值")
 
        方法三、要监听的属性值（currentParams.selOrgId）需要事先声明，否则监听不到
        this.currentParams.selOrgId = "改变后的值";
    }
}