javascript - 如何在 JavaScript 中创建特殊的 OR 语句

Question

我正在尝试创建一个程序，它会循环询问您的名字、中间名和姓氏，直到您输入 'EXIT' 或 'exit' 作为姓氏。我在这里使用的 || 语句运算符不起作用，我似乎找不到答案。有什么想法吗？

var FirstName = '' ;
var MiddleName = '' ;
var LastName = '' ;
var FullName = '' ;

while (LastName != 'EXIT' || LastName != 'exit' ) {

    FirstName = prompt ('What is your first name');
    MiddleName = prompt ('What is your middle name');
    LastName = prompt ('What is your last name');

    FullName = FirstName + ' ' + MiddleName + ' ' + LastName;

    alert ('Welcome, ' + FullName);
}

干杯:)

Answer 1

您需要检查您的 bool 逻辑。这是一个工作代码示例:

var FirstName = '' ;
var MiddleName = '' ;
var LastName = '' ;
var FullName = '' ;

while (LastName != 'EXIT' && LastName != 'exit' ) { /* updated */

    FirstName = prompt ('What is your first name');
    MiddleName = prompt ('What is your middle name');
    LastName = prompt ('What is your last name');

    FullName = FirstName + ' ' + MiddleName + ' ' + LastName;

    alert ('Welcome, ' + FullName);
}

!A AND !B 而不是 !A OR !B - 后者在您的情况下始终为真，因为您正在将同一变量与两个不同的字符串进行比较.