<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>计数器</title>
<link rel="stylesheet" href="./index.css"/>
</head>
<body>
<div id="app">
<div class="input-num">
<button @click="add">
+
</button>
<span>{{ num }}</span>
<button @click="sub">
-
</button>
</div>
<img src="http://www.itheima.com/images/logo.png" alt="" />
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
var app = new Vue({
el:"#app",
data:{
num:1
},
methods:{
add:function(){
if(this.num<10){
this.num++;
}else{
alert("别点啦！最大了！")
}
},
sub:function(){
if(this.num>0){
this.num--;
}else{
alert("别点啦！最小了！")
}
}
},
})
</script>
</body>
</html>
