<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="app">
<p> {{ number }} </p>
<p> double1: {{ double1 }} </p>
<input v-model="double2">
{{ double2 }}
</div>
</body>
<script>
var app = new Vue({
el: '#app',
data: {
number: 5
},
computed: {
double1() {
// 当 double1 变动时才会从新执行
return this.number * 2
},
// double2() {
// // 批改 input 报错，须要 setter
// return this.number * 2
// },
double2: {
get: function() {
return this.number * 2
},
// 批改须要 setter 拦挡
set: function(v) {
this.number = v / 2
}
},
}
})
</script>
</html>
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