选择不了
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<script>
var xy =100;
var xz = prompt('请选择序号：')
switch(xz){
case 1:
var cq = prompt('请输入你要存入的钱数');
xy = xy + cq;
prompt('目前为：'+xy+'元');
break;
case 2:
var qq = prompt('请输入取出的钱数');
xy = xy - qq;
prompt('目前为：'+xy+'元');
break;
}
alert(xz);
</script>
<body>
</body>
</html>
