金融数字，三位逗号隔开

/* 金融数字，三位逗号隔开*/
function splitNum(nStr){
 nStr += '';
 x = nStr.split('.');
 x1 = x[0];
 x2 = x.length > 1 ? '.' + x[1] : '';
 var rgx = /(\d+)(\d{3})/;
 while (rgx.test(x1)) {
  x1 = x1.replace(rgx, '$1' + ',' + '$2');
 }
 return x1 + x2;
}