new Vue({
el: "#app",
data() {
return {
count: 1,
}
},
methods: {
change() {
this.count++
},
},
computed: {
sum() {
return this.count + 1
},
},
})
<div id="app">
<p>{{sum}}</p>
<button @click="change">+1</button>
</div>