//App.vue
<template>
<div id="app">
<!-- <img src="./assets/logo.png"> -->
<!-- <router-view/> -->
<div class="num">
<button @click="sub">-</button>
<span>{{num}}</span>
<button @click="add">+</button>
</div>
</div>
</template>
<script>
export default {
name: 'App',
data:()=>{
return{
num:0
}
},
methods: {
add:function(){
if(this.num<10){
this.num++
}else{
alert('已经最大了')
}
},
sub:function(){
if(this.num>0){
this.num--
}else{
alert('已经最小了')
}
}
}
}
</script>
<style>
#app {
font-family: 'Avenir', Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-align: center;
color: #2c3e50;
margin-top: 60px;
}
.num button{
width: 50px;
height: 25px;
color: red;
padding: 0;
}
.num span{
display: inline-block;
width: 44px;
height: 19px;
border: 3px solid #ccc
}
</style>