<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="./vue.js"></script>
</head>
<body>
<div id="app">
<input type="text" v-model="name">
</div>
</body>
<script>
const app = Vue.createApp({
data() {
return {
name: 'szw'
}
}, watch: {
//只要name发送变化，就会执行对应的函数
name: function (val) {
console.log(val)
}
}
}).mount('#app')
</script>
</html>
组合式
<template>
<div>
<input type="text" v-model="age">
<input type="text" v-model="age2">
</div>
</template>
<script>
import { ref, computed, watch } from 'vue'
export default {
setup() {
let age = ref(0)
let age2 = computed({
get() {
return +age.value + 1
},
set(value) {
return age.value = value - 1
}
})
watch([age,age2], (newValue,oldValue) => {
console.log('老数据', oldValue)
console.log('新数据', newValue)
})
return {
age, age2
}
}
}
</script>
