vue failure / listener object properties change when the listener objects

info is an object

//第一种
watch: {
   info(newValue,oldValue) {
　　　　console.log(newValue)
　　}
 }

//第二种
watch: {
   info: {
　　　　handler(newValue, oldValue) {
　　　　　　console.log(newValue)
　　　　},
　　　　deep: true
　　}
 }

The difference is that: first info only be reassigned to be effective (v-model binding property values info when the listener does not take effect)
will take effect when the second when the info object properties change

---

Other methods:
1. by calculating properties

computed: {
　　info() {
　　　　....
　　}
},

2. For property listens

'info.name'(newValue, oldValue) {
　　　　console.log(newValue)
　　}