<div id="app5">
<button @click="exchange(-5)">点我减五</button>
<button @click="exchange(5)">点我加五</button>
</div>
<script>
const app5=new Vue({
el:'#app5',
data:{},
methods:{
exchange(a){
app3.num += a
}
}
})
</script>
标签：el,vue,const,methods,exchange,app5,学习 From： https://www.cnblogs.com/cocotun/p/17765784.html