我选择的选项1之后和i之后添加的号码,例如100它导致这样100100不能使用+当尝试添加数
这是代码:
var userAmount;
var userMoney = 100;
var totalMoney;
alert("1. Add");
alert("2. Subtraction");
var userOption = prompt("Enter your selection: ");
if (userOption == 1) {
userAmount = prompt("Amount: ");
var totalMoney = userMoney + userAmount;
alert("Total is " + totalMoney);
}
else {
userAmount = prompt("Amount: ");
var totalMoney = userMoney - userAmount;
alert("Total is" + totalMoney);
}
'prompt'返回字符串,而不是数量 – Grundy
使用'号(userAmount)' – elclanrs