JS数字金额大写转换

/** 数字金额大写转换(可以处理整数,小数,负数) */  
var digitUppercase = function(n) {
	var fraction = ['角', '分'];
	var digit = [
		'零', '壹', '贰', '叁', '肆',
		'伍', '陆', '柒', '捌', '玖'
	];
	var unit = [
		['元', '万', '亿'],
		['', '拾', '佰', '仟']
	];
	var head = n < 0 ? '欠' : '';
	n = Math.abs(n);
	var s = '';
	for (var i = 0; i < fraction.length; i++) {
		s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');
	}
	s = s || '整';
	n = Math.floor(n);
	for (var i = 0; i < unit[0].length && n > 0; i++) {
		var p = '';
		for (var j = 0; j < unit[1].length && n > 0; j++) {
			p = digit[n % 10] + unit[1][j] + p;
			n = Math.floor(n / 10);
		}
		s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
	}
	return head + s.replace(/(零.)*零元/, '元')
		.replace(/(零.)+/g, '零')
		.replace(/^整$/, '零元整');
};

console.log(digitUppercase(12.3));