1、ref 深拷贝 视图层更新不改变源数据
const num = 1
const refNum = ref(num)
const click = ()=>{
refNum++ //refNum 已经改变了，但原数据num不变
}
2、toRef 源数据改变不更新视图
3、toRefs 传入一个响应式对象
const obj =reactive{name:"iwen",age:19}//取值为obj.name
return (...toRefs(obj))//取值为name age
标签：obj,name,视图,refNum,num,vue3,const From： https://www.cnblogs.com/iwen1992/p/17592359.html