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aleecan/username letter validation

Created May 6, 2015 11:11
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username letter validation
function isLetters(un){
var a=un;
var count=0;
for (var i = a.length - 1; i >= 0; i--) {
if ((a.charCodeAt(i)>64 && a.charCodeAt(i)<91) || (a.charCodeAt(i)>96 && a.charCodeAt(i)<123) ) {
count++;
};
};
if (count!=a.length) {
return false;
};
return true;
}
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