[Rise]

helloterry8,

var string = '0123456789ABCDEF';
var result = '';

while (chislo) {
	result = string[chislo % vihod] + result;
	chislo = Math.floor(chislo / vihod);
}

обратно:

var string = '0123456789ABCDEF';
var result = 0;

var index = chislo.length;
while (index) {
	result += Math.pow(vhod, chislo.length - index--) * string.indexOf(chislo[index]);
}