1.watch可以监听data中数据的改变
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<input v-model="aa"/>
<input v-model="bb"/>
<input v-model="cc"/>
<input v-model="dd"/>
</div>
<script>
var app = new Vue({
el:"#app",
data:{
aa:'aaaaa',
bb:'bbbbb',
cc:'ccccc',
},
methods:{},
watch:{
aa:function () {// 当aa发生变化时执行的操作
this.cc = this.aa + this.bb ;
},
'bb':function () {// 当bb发生变化时执行的操作
this.cc = this.aa + this.bb ;
}
},
computed:{
dd: function () {// dd会随着aa、bb的变化进行计算
return this.aa + this.cc;
}
}
})
</script>
</body>
</html>
