12、Vue-监听器watch
<!DOCTYPE html>
<html lang="zh">
<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">
<title>行找的皮卡丘</title>
</head>
<body>
<div id="app">
<input type="text" v-model="msg">
<h3>{{msg}}</h3>
<button @click="stus[0].name='henry'">改变</button>
<h4>{{stus[0].name}}</h4>
</div>
</body>
<script type="text/javascript" src="js/vue.min.js">
</script>
<script type="text/javascript">
new Vue({
el: '#app',
data() {
return {
msg: "",
stus:[{"name":"Lz12Code"}],
}
},
watch: {
msg: function(newV, oldV) {
console.log(newV, oldV);
if (newV === 'hello') {
console.log("你输入了hello")
}
},
stus:{
deep:true,
handler:function(newV,oldV){
console.log(newV)
}
}
}
})
</script>
</html>