Under the VUE framework Vue3, use watch to monitor the Proxy object that does not point to value under the ref ------ VUE framework

<template>
    <h1>{
    
    { counter }}</h1>
    <button @click="counter++">按一下</button>
    <h1>{
    
    { data.a.b.c.counter }}</h1>
    <button @click="data.a.b.c.counter++">按一下</button>
</template>

<script>
import {watch,ref} from "vue";
export default {
    name : "App",
    setup(){
        let counter = ref(1);
        let data = ref({
            a : {
                b : {
                    c : {
                        counter : 1
                    }
                }
            }
        });
        // 错误的,因为获取的是一个值
        // watch(counter.value,(newValue,oldValue)=>{
            
        // });
        // 可以监视到,效果和reactive是一样的,因为这里都是一个Proxy对象
        watch(()=>counter.value,(newValue,oldValue)=>{
            console.log(newValue,oldValue)
        });
        // 直接放进去,默认是没有开启深度监视的 
        watch(data,(newValue,oldValue)=>{
            console.log(newValue,oldValue)
        },{immediate:true,immediate:true});
        // 这种可以监视到,因为底层还是Proxy对象
        // 不需要箭头函数去指
        // ref下如果包裹的是一个对象,而且watch没有指向value那个Proxy,而是指向对象本身,就不会开启深度监视
        watch(data.value,(newValue,oldValue)=>{
            console.log(newValue,oldValue)
        },{deep:false});// 一定会默认启动deep深度监视,配置是无效的
        return {counter,data};
    }
}
</script>

<style>

</style>

<template>

    <h1>{ { counter }}</h1>

    <button @click="counter++">Click</button>

    <h1>{ { data.a.b.c.counter }}</h1>

    <button @click="data.abccounter++">Click</button>

</template>

<script>

import {watch,ref} from "vue";

export default {

    name : "App",

    setup(){

        let counter = ref(1);

        let data = ref({

            a : {

                b : {

                    c : {

                        counter : 1

                    }

                }

            }

        });

        // Wrong, because what is obtained is a value

        // watch(counter.value,(newValue,oldValue)=>{

           

        // });

        // You can monitor that the effect is the same as reactive, because here is a Proxy object

        watch(()=>counter.value,(newValue,oldValue)=>{

            console.log(newValue,oldValue)

        });

        //Put it in directly. By default, in-depth monitoring is not enabled.

        watch(data,(newValue,oldValue)=>{

            console.log(newValue,oldValue)

        },{immediate:true,immediate:true});

        // This can be monitored because the underlying layer is still a Proxy object

        // No need for arrow functions to point to

        // If an object is wrapped under ref, and watch does not point to the Proxy of value, but points to the object itself, deep monitoring will not be enabled.

        watch(data.value,(newValue,oldValue)=>{

            console.log(newValue,oldValue)

        },{deep:false});//deep monitoring will be started by default, and the configuration is invalid.

        return {counter,data};

    }

}

</script>

<style>

</style>