我是一个初学者,我有此Javascript问题我的工作。我需要提示用户输入为R / R或F / F。不过,我想实现一个循环,这样的情况下,他们进入其他的东西,我的程序不会崩溃。我将如何去这样做呢?
function CalculatePayroll()
{
employeeNumber=prompt("Please enter the employee number");
employeeName=prompt("Please enter the employee's name");
employeeDepartment=prompt("Please enter the employee's department");
employeesHours=prompt("Please enter the number of hours the employee
worked");
employeeTypeCode=prompt("Please enter the employee's type code: F/f or
R/r");
if(employeeTypeCode=="R"||employeeTypeCode=="r")
{
RegularWorkerPayroll();
CalculateTotalPay();
DisplayPaySlip();
}
else if(employeeTypeCode=="F"||employeeTypeCode=="f")
{
FacultyPayroll();
CalculateTotalPay();
DisplayPaySlip();
}
}
我想有一个循环来实现,这样,如果他们进入类似“B”或什么的,我可以连续直到他们进入正确的汉字提示他们。我尝试了不同的时间,但我刚刚结束了一个无限循环笑。
您可以使用while
循环与数组和includes
的测试。然后用switch
和toLowerCase
调用函数:
employeeTypeCode=prompt("Please enter the employee's type code: F/f or R/r");
while (!["F", "f", "R", "r"].includes(employeeTypeCode)) {
employeeTypeCode=prompt("Please enter the employee's type code: F/f or R/r");
}
switch (employeeTypeCode.toLowerCase()) {
case "f":
FacultyPayroll();
break;
case "r":
RegularWorkerPayroll();
break;
}
CalculateTotalPay();
DisplayPaySlip();
使用如下while循环:
var employeeTypeCode;
while (employeeTypeCode != "r" && employeeTypeCode != "f") {
employeeTypeCode = prompt("Please enter the employee's type code: F/f or R/r").toLowerCase();
}
您可以使用do-while
循环来获取用户的输入,并保持请求,如果他们进入了无效的选项。
您可以使用.toLowerCase()
您的输入,所以你只需要检查你的字母的小写版本。然后,你也可以使用一个对象来你的信映射到它调用相关的函数,该函数employeeTypeCode
特定功能,
function calculatePayroll() {
var options = {
'r': RegularWorkerPayroll,
'f': FacultyPayroll
}
employeeNumber = prompt("Please enter the employee number");
employeeName = prompt("Please enter the employee's name");
employeeDepartment = prompt("Please enter the employee's department");
employeesHours = prompt("Please enter the number of hours the employee worked ");
do {
employeeTypeCode = prompt("Please enter the employee's type code: F/f or R / r ").toLowerCase();
} while(employeeTypeCode !== "r" && employeeTypeCode !== "f");
options[employeeTypeCode]();
CalculateTotalPay();
DisplayPaySlip();
}
此外,它通常是很好的做法,只使用大写字母函数名,如果它是一个构造函数,而不是一个普通的函数像这样的。