vue2 v-on参数传递 | 知远同学

学习v-on参数传递
<!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>
        .box{
            border: 3px solid #000000;
            border-radius: 10px;
            padding: 20px;
            margin: 20px;
            width: 210px;
        }
        h3 {
            margin: 10px 0 20px 0;
            text-align: center;
        }
        p {
            margin: 20px;
        }
    </style>
</head>
<body>
    <div id="app">
        <div class="box">
            <h3>小黑自动售货机</h3>
            <button v-on:click="buy(5)">可乐5元</button>
            <button v-on:click="buy(10)">咖啡10元</button>
            <button v-on:click="buy(8)">牛奶8元</button>
        </div>
        <p>银行卡余额{{money}}</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(a){
                    if (this.money >= a){
                        this.money = this.money - a
                    }else{
                        alert('余额不足')
                    }
                }
            }
        })
    </script>
</body>
</html>