<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>4.姓名案例_计算属性简写</title>
<script type="text/javascript" src="../vue.js"></script>
</head>
<body>
<div id="root">
姓：<input type="text" v-model="firstName"> <br>
名：<input type="text" v-model="lastName"> <br>
姓名： <span>{{fullName}}</span>
</div>
<script type="text/javascript">
const vm = new Vue({
el: '#root',
data: {
firstName: "张",
lastName: "三",
fullName: "张-三"
},
watch: {
firstName(newValue){
setTimeout(()=>{
this.fullName = newValue + '-' + this.lastName
}, 1000)
},
lastName(newValue){
this.fullName = this.firstName + '-' + newValue
}
}
})
console.log(vm)
</script>
</body>
</html>