javascript - != operator not working in while loop condition when combined with || OR -


i have basic while loop executing prompt's input value, running through condition. odd reason when use !== along || in same condition not work. know can add additional parameters compare against using isnan , other logical operators, makes no sense why not work , route working.

var number; {     number = parseint(prompt('enter 1 or 2')); } while ((number !== 1) || (number !== 2));

if run following code single expression compare against, work no problem, in previous statement not have multiple conditions compare against.

var number; {     number = parseint(prompt('enter 1 or 2')); } while (number !== 1);

thanks!

if number 1, lhs false isn't 2 rhs true , overall test true.

if number not 1, lhs true , overall test true.

you need && there saying if number not 1 , not 2.


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