JS number format func

numberFormat.js

function numberFormat(number, dec, dsep, tsep) {
	if (isNaN(number)) return "";
	number = number.toFixed(dec || 0);	
	var pindex = number.indexOf('.'), fnums, decimals, parts = [];
	if (pindex > -1) {
		fnums = number.substring(0, pindex).split('');
		decimals = (dsep || '.') + number.substr(pindex+1);
	}
	else {
		fnums = number.split('');
		decimals = '';
	}
	do {
		parts.unshift(fnums.splice(-3, 3).join(''));
	} while (fnums.length);
	return parts.join(tsep || ',') + decimals;
}

// test...
var nums = {
	"numberFormat2(90000)" : numberFormat2(90000),
	"numberFormat2(90000, 2)" : numberFormat2(90000, 2),
	"numberFormat2(1000.754)" : numberFormat2(1000.754),
	"numberFormat2(1000.754, 2)" : numberFormat2(1000.754, 2),
	"numberFormat2(1000.754, 0, ',', '.')" : numberFormat2(1000.754, 0, ',', '.'),
	"numberFormat2(1000.754, 2, ',', '.')" : numberFormat2(1000.754, 2, ',', '.'),
	"numberFormat2(1000000000)" : numberFormat2(1000000000),
	"numberFormat2(1000000000.987654, 2)" : numberFormat2(1000000000.987654, 2)
}
Object.keys(nums).forEach(function(k) {
	console.log(k + '    ' + nums[k]);
});