<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>计数器</title>
</head>
<body>
<div id="app">
<div class="input-num">
<button @click="sub">
-
</button>
{{num}}
<button @click="add">
+
</button>
</div>
</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("不能再加了");
},
sub:function()
{
if(this.num>0)
{
this.num--;
}
else alert("不能再减了");
}
}
})
</script>
</body>
</html>