一个有趣的 demo

this.smalltoBIG(43533534.78); //肆仟叁佰伍拾叁万叁仟伍佰叁拾肆元柒角捌分
	
smalltoBIG (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');
},