Question

我正在尝试创建一个程序，它会一直询问您循环中的第一个，中间名和姓，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，我似乎无法找到答案。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

你需要检查你的布尔逻辑。这是一个有效的代码示例：

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，因为您将同一个变量与两个不同的字符串进行比较。

如何在JavaScript中创建特殊的OR语句

1 个答案: