35-ATM.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let balance = 100
        let loop = true
        while (loop) {
            let choice = +prompt(`请输入数字选择
        1. 存钱
        2. 取钱
        3. 查看余额
        4.退出`)
            switch (choice) {
                case 1:
                    let num = +prompt("请输入金额")
                    balance += num
                    break
                case 2:
                    let qu = +prompt("请输入金额")
                    if (qu >= balance) {
                        alert("取的钱太多啦")
                    } else {
                        balance -= qu
                    }
                    break
                case 3:
                    alert(`余额还有${balance}元`)
                    break
                case 4:
                    loop = false
            }
        }
    </script>
</body>

</html>