没啥好说的,看代码吧= =
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div id="app">
<input type="text" v-model="msg" />
<h4>{{msg}}</h4>
</div>
<script type="text/javascript" src="js/vue.min.js"></script>
<script type="text/javascript">
new Vue({
el:"#app",
data(){
return{
msg:''
}
},
watch:{
msg:function(newV,oldV){
console.log(newV +"***"+ oldV);
if(newV==='wangSir'){
console.log("我是你wangSir")
}
}
}
})
</script>
</body>
</html>