<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta name="author" content="杨欣">
<title></title>
<style>
html,
body {
margin: 0;
padding: 0
}
</style>
<script src="https://cdn.bootcss.com/vue/2.6.10/vue.min.js"></script>
</head>
<body>
<div id="app">{{obj.name}}</div>
<script>
let app = new Vue({
el: "#app",
data: {
obj: {
name: 'yx'
}
},
computed: {
//1.把要监听的属性作为计算属性
// name() {
// return this.obj.name
// }
},
watch: {
// name(newVal, oldVal) {
// console.log(newVal, oldVal)
// }
// 2.监听obj，加上deep
obj: {
handler(newVal, oldVal) {
console.log(newVal, oldVal)
},
deep: true
}
},
})
</script>
</body>
</html>
