/** * 格式化数字 * Author : Z,Mingyu * 参数： * prmNum (Number) : 要格式化的数字 * prmPtn (String) : 格式化规则，例如：#,##0.00 * * prmNullValue : 当要格式化的数字为null、空或非数字时，返回的结果。默认为0 */ function formatNum(prmNum,prmPtn,prmNullValue){ var nullValue = prmNullValue ? prmNullValue : 0; if(prmNum == "" || prmNum == null) return nullValue; prmNum = prmNum.replace(/\,/g,""); if(isNaN(prmNum)) return nullValue; if(prmPtn == "" || prmPtn == null) return prmNum; var ptnLen = prmPtn.length; var pointIndex = prmPtn.indexOf("."); var groupIndex = prmPtn.indexOf(","); var pointLen = (pointIndex == -1 ? 0 : ptnLen - pointIndex - 1); prmNum = parseFloat(prmNum).toFixed(pointLen) + ""; if(groupIndex != -1){ if(pointIndex == -1) pointIndex = ptnLen; var len = pointIndex - groupIndex - 1; var reg = new RegExp("(-?\\d+)(\\d{"+len+"})"); while(reg.test(prmNum)) prmNum = prmNum.replace(reg,"$1,$2"); } return prmNum; }