Javascript or operator not working

Question

var strExt  = GetAttributeFromItemTable(itemTable, "Ext", "FileType");

I did a alert for strExt and it resolves. if (strExt!='wav') { // this works }

if (strExt!='wav' || strExt!='mp3')
{
// this does not work.
}

Answer 1

Your logic is flawed:

if your variable strExt was equal to 'wav' it would not be equal to 'mp3', and versa-visa.

Please explain your desired results more clearly.

I think what you're trying to say is something like (neither 'wav' nor 'mp3'):

if ( !( strExt == 'wav' || strExt == 'mp3' ) )

which is logically equivalent to (not 'wav' and not 'mp3'):

if ( strExt != 'wav' && strExt != 'mp3' ) )