vue watch about property monitoring within an object

vue can listen for changes in data through watch. The usual way of writing is:

data: {
 a: 100
},
watch: {
 a(newval, oldVal) {
  // Do something.  .  .  (newval, oldVal)
 }
} 

vue listens to the entire object, as follows:

•deep: true Depth monitoring

data: {
 return {
  msg: {
   name: 'hahah',
   color: 'red'
  }
 }
}
watch: {
 msg: {
  handler(newValue, oldValue) {
   // Do something.  .  .   (newValue)
 },
 deep: true
} 

If you listen to a specific property in the object, you can implement it by computed as an intermediate layer:

computed: {
 name() {
  return 
 }
},
watch:{
 name(newValue, oldValue) {
   // Do something.  .  .   (newval, oldVal)
 }
} 

Summarize

The above is the relevant knowledge about vue watch attribute monitoring introduced to you by the editor. I hope it will be helpful to you. If you have any questions, please leave me a message. The editor will reply to you in time!