js 金额小写转换为大写

<script>
jQuery(document).ready(function () {
//当金额文本框失去焦点时，自动将数字转化为大写填充到 大写的文本框中
$("#Amount").blur(function () {
var amount = $("#Amount").val();
amount = AmountLtoU(amount);
$("#CapitalAmount").val(amount);
});
}); function AmountLtoU(num) {
///<summery>小写金额转化大写金额</summery>
///<param name=num type=number>金额</param>
if (isNaN(num)) return "";
var strPrefix = "";
if (num < 0) strPrefix = "(负)";
num = Math.abs(num);
if (num >= 1000000000000) return "无效数值！";
var strOutput = "";
var strUnit = '仟佰拾亿仟佰拾万仟佰拾元角分';
var strCapDgt = '零壹贰叁肆伍陆柒捌玖';
num += "00";
var intPos = num.indexOf('.');
if (intPos >= 0) {
num = num.substring(0, intPos) + num.substr(intPos + 1, 2);
}
strUnit = strUnit.substr(strUnit.length - num.length);
for (var i = 0; i < num.length; i++) {
strOutput += strCapDgt.substr(num.substr(i, 1), 1) + strUnit.substr(i, 1);
}
return strPrefix + strOutput.replace(/零角零分$/, '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");
};
</script>