Vue:watch监视

<script setup lang="ts">  
import { ref,watch} from 'vue';  
let num2 = ref('0'); // 用于存储二进制字符串  
watch(num2,(newvalue,oldvalue)=>{
    console.log(num2+'和新数据'+newvalue+'和旧数据'+oldvalue);
})
</script>  

[object Object]和新数据和旧数据0
Change.vue:19 [object Object]和新数据1111011和旧数据
Change.vue:19 [object Object]和新数据11110000101101001和旧数据1111011
Change.vue:19 [object Object]和新数据1和旧数据11110000101101001

let person=ref({
    name:'李四',
    age:30
})
watch(num2,(newvalue,oldvalue)=>{
    console.log(num2+'和新数据'+newvalue+'和旧数据'+oldvalue);
})
function changeAge(){
    person.value.age++;
}
function changeName(){
    person.value.name+='~';
}
function changePerson(){
    person.value={
        name:'王二',
        age:90
    }
}
watch(person,(newvalue,oldvalue)=>{
    console.log(newvalue+'和'+oldvalue);
})

watch(person,(newvalue,oldvalue)=>{
    console.log(newvalue+'和'+oldvalue);
},{deep:true})