JS之金额转换为大写

金额转换为大写函数如下：

export function convertToChineseCapital(n) {
  if (n == 0) {
    return "零";
  }
  if (!/^(\+|-)?(0|[1-9]\d*)(\.\d+)?$/.test(n))
    return "数据非法";
  var unit = "仟佰拾亿仟佰拾万仟佰拾元角分", str = "";
  n += "00";
  var a = parseFloat(n);
  if (a < 0) {
    n = n.substr(1);
  }
  var p = n.indexOf('.');
  if (p >= 0) {
    n = n.substring(0, p) + n.substr(p + 1, 2);
  }

  unit = unit.substr(unit.length - n.length);

  for (var i = 0; i < n.length; i++)
    str += '零壹贰叁肆伍陆柒捌玖'.charAt(n.charAt(i)) + unit.charAt(i);
  if (a > 0) {
    return str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(万|亿|元)/g, "$1").replace(/(亿)万|壹(拾)/g, "$1$2").replace(/^元零?|零分/g, "").replace(/元$/g, "元整");

  } else {

    return "负" + str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(万|亿|元)/g, "$1").replace(/(亿)万|壹(拾)/g, "$1$2").replace(/^元零?|零分/g, "").replace(/元$/g, "元整");
  }
}