@[TOC]Title:
- There are 100 yuan in it.
2. If you deposit money, just enter the amount of money plus the amount you deposited first, and then a balance prompt box will pop up
3. If you withdraw money, subtract the amount of money you withd, and then a balance prompt box will pop up
4. If you display the balance , The balance will be output.
5. If you exit, the exit information prompt box will pop up.
Source: Dark Horse Front End Course
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
var balance = 100;
while (true) {
var way = prompt('请输入您要的操作：\n1.存钱\n2.取钱\n3.显示余额\n4.退出')
switch (way) {
case '1': var str1 = prompt('请输入你要存入的金额：');
balance += parseFloat(str1);
alert('您的余额是：' + balance);
// return balance;
break;
case '2': var str2 = prompt('请输入你要取出的金额：');
balance = balance - parseFloat(str2);
alert('您的余额是：' + balance);
break;
case '3': alert('您的余额是：' + balance);
break;
case '4':
alert('感谢您的使用');
break;
default:
alert('您输入的不正确 请输入1~4之间的数');
}
if (way == 4) {
break;
}
}
</script>
</head>
<body>
</body>
</html>