how to write Or condition in javascript?

is it correct?-

i开发者_开发百科f (expiryMonth == "MM" || expiryMonth == "mm") {

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Yes, that's correct. MDC (Mozilla Developer Center) has plenty of information about logical operators.

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Yes, that's correct. You may be able to avoid the use of || in this situation by using the toLowerCase() or toUpperCase() method on strings:

if (expiryMonth.toLowerCase() == "mm") {

or

if (expiryMonth.toUpperCase() == "MM") {

Of course, this would also match Mm and mM, as Tim points out in the comments.

• toUpperCase()
• toLowerCase()

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You could eliminate the need for the or statement and just set expiryMonth to lowercase.

expiryMonth=expiryMonth.toLowerCase(); // You can also use toUpperCase();

Then run your if statement.