Watch: {
// tel is data () data inside tel, newVal tel is a value of change, oldVal the value before the change tel
tel (newVal, oldVal) {
the console.log (newVal, oldVal)
IF (newVal =! "" ) {
the this .isDisabled = to false
} the else {
the this .isDisabled = to true
}
}
},
Watch: {
// tel is data () data inside tel, newVal tel is a value of change, oldVal the value before the change tel
tel: {
Handler (newVal, oldVal) {
the console.log (newVal, oldVal)
IF ( = newVal "") {!
this.isDisabled to false =
} {the else
this.isDisabled = to true
}
},
// deep depth attribute objects listener
deep: true,
there is a characteristic // when so used watch, that is, when the value of when once bound, the listener does not perform a function, only the value changes will be performed.
// If we need to also perform the function when the first binding value, you need to use immediate property. When traditional values such as when a parent component to child component dynamic, sub-assemblies props for the first time to get the default value of the parent assembly came also need to perform a function, then you need the immediate set to true.
immediate: to true
}
},