<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style type="text/css">
.vendingMachine{
margin: 10px 0;
border: 2px solid black;
width: 250px;
height: 100px;
border-radius: 10px;
box-shadow: 2px 2px 2px #ccc;
text-align: center;
/* display: flex;
align-items: center;
justify-content: center; */
}
</style>
</head>
<body>
<div id="app">
<div class="vendingMachine">
<h3>小黑自动售货机</h3>
<button @click="buy(5)">可乐5元</button>
<button @click="buy(10)">咖啡10元</button>
<button @click="buy(8)">牛奶8元</button>
</div>
<p>银行卡余额：{{money}}元</p>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
money: 100
},
methods:{
buy(price){
if (this.money<price){
alert("钱不够啦")
}else{
this.money -= price
}
}
}
})
</script>
</body>
</html>
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