大写金额转换
在金融行业中，有时会有将小写数字金额转换为大写金额的情况，下面的js代码给我们一个从正则的角度实现的想法：
<html><head><script type="text/javascript">function calculate (num) {var strOutput = "";var strUnit = '仟佰拾亿仟佰拾万仟佰拾元角分';num += "00";var intPos = num.indexOf('.');if (intPos >= 0)num = num.substring(0, intPos) + num.substr(intPos + 1, 2);strUnit = strUnit.substr(strUnit.length - num.length);for (var i=0; i < num.length; i++)strOutput += '零壹贰叁肆伍陆柒捌玖'.substr(num.substr(i,1),1) + strUnit.substr(i,1);return strOutput.replace(/零角零分$/, '整').replace(/零[仟佰拾]/g, '零').replace(/零{2,}/g, '零').replace(/零([亿|万])/g, '$1').replace(/零+元/, '元').replace(/亿零{0,3}万/, '亿').replace(/^元/, "零元");};alert(calculate("100000100101.01"));</script></head></html>