while和switch综合案例
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body><script>// 1.不断弹出对话框// 3.金额变量let money = 100while (true) {let str = prompt(`请您选择操作：1.存钱2.取钱3.查看余额4.退出`)// 2.如果输入的是4 则退出循环if (str == '4') {break}// 4.switch 加减操作switch (str) {case '1' :let cun = +prompt('请输入存入金额：')// mooney = money + cunmoney += cunbreakcase '2' :let qu = +prompt('请输入取出金额：')money -= qubreakcase '3':alert(`您卡上的余额为: ${money}元`)break}}</script></body></html>
