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Test if string is alphanumeric in Javascript

function isAlphaNum(alphane) {
	var numaric = alphane;
 
	for(var j=0; j<numaric.length; j++) {
		var alphaa = numaric.charAt(j);
		var hh = alphaa.charCodeAt(0);
 
		if((hh > 47 && hh<58) || (hh > 64 && hh<91) || (hh > 96 && hh<123)) {
		} else {
			return false;
		}
		}
	return true;
}

This Javascript function tests, if a given string consists only of alphanumeric characters.

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