格式化数字js

/**
*格式化数字
*/
Number.prototype.format = function(pattern) {
var strarr = this.toString().split('.');
var fmtarr = pattern ? pattern.split('.') : [''];
var retstr = '';
// 整数部分
var str = strarr[0];
var fmt = fmtarr[0];
var i = str.length - 1;
var comma = false;
for (var f = fmt.length - 1; f >= 0; f--) {
switch (fmt.substr(f, 1)) {
case '#':
if (i >= 0) retstr = str.substr(i--, 1) + retstr;
break;
case '0':
if (i >= 0) retstr = str.substr(i--, 1) + retstr;
else retstr = '0' + retstr;
break;
case ',':
comma = true;
retstr = ',' + retstr;
break;
}
}
if (i >= 0) {
if (comma) {
var l = str.length;
for (; i >= 0; i--) {
retstr = str.substr(i, 1) + retstr;
if (i > 0 && ((l - i) % 3) == 0) retstr = ',' + retstr;
}
} else retstr = str.substr(0, i + 1) + retstr;
}

retstr = retstr + '.';
// 处理小数部分
str = strarr.length > 1 ? strarr[1] : '';
fmt = fmtarr.length > 1 ? fmtarr[1] : '';
i = 0;
for (var f = 0; f < fmt.length; f++) {
    switch (fmt.substr(f, 1)) {
    case '#':
        if (i < str.length) retstr += str.substr(i++, 1);
        break;
    case '0':
        if (i < str.length) retstr += str.substr(i++, 1);
        else retstr += '0';
        break;
    }
}
return retstr.replace(/^-,+/, '').replace(/^,+/, '').replace(/\.$/, '');

};
/**

• 格式成百分数
  /
  Number.prototype.toPercent = function(pattern) {
  var num = this * 100;
  pattern = pattern || '#,###,###.0';
  return num.format(pattern) + "%";
  };
  /*

• 格式货币
  /
  Number.prototype.toMoneyFloat = function(pattern) {
  pattern = pattern || '#,###,###.00';
  return this.format(pattern);
  };
  /*

• 短float
  /
  Number.prototype.toShortFloat = function(pattern) {
  pattern = pattern || '###.00';
  return this.format(pattern);
  };
  /*

• 格式无精度的货币
  /
  Number.prototype.toMoney = function(pattern) {
  pattern = pattern || '#,###,###';
  return this.format(pattern);
  };
  /*

• 格式成大写人民币单位数字
  /
  Number.prototype.toRMB = function () {
  var number = Math.round(this * 100) / 100;
  number = number.toString(10).split(".");
  var a = number[0];
  var cn = "零壹贰叁肆伍陆柒捌玖";
  var cnNum = "";
  var len = a.length - 1;
  for (var i = 0; i <= len; i++) cnNum += cn.charAt(parseInt(a.charAt(i))) + [
  ["元", "万", "亿", "万"][Math.floor((len - i) / 4)], "拾", "佰", "仟"][(len - i) % 4];
  if (number.length == 2 && number[1] != "") {
  var a = number[1];
  for (var i = 0; i < a.length; i++) cnNum += cn.charAt(parseInt(a.charAt(i))) + ["角", "分"][i]
  }
  //不带零的读法
  /cnNum = cnNum.replace(/零佰|零拾|零仟|零角/g, "零");
  cnNum = cnNum.replace(/零{2,}/g, "零");
  cnNum = cnNum.replace(/零(?=元|万|亿)/g, "");
  cnNum = cnNum.replace(/亿万/, "亿");
  cnNum = cnNum.replace(/^元零?/, "");*/

  //带零的读法
  cnNum = cnNum.replace(/零佰|零拾|零仟|零角/g, "零");
  cnNum = cnNum.replace(/零{2,}/g, "零");
  cnNum = cnNum.replace(/零(?=元)/g, "");
  cnNum = cnNum.replace(/零万/, "万零");
  cnNum = cnNum.replace(/零亿/, "亿零");
  cnNum = cnNum.replace(/零{2,}/g, "零");
  cnNum = cnNum.replace(/零(?=元|万|亿)/g, "");
  cnNum = cnNum.replace(/亿万/, "亿");
  cnNum = cnNum.replace(/^元零?/, "");
  if (cnNum != "" && !/分$/.test(cnNum)) cnNum += "整";
  return cnNum;
  };
  /**

• 阿拉伯数字转中文

• @param cnType 0/""/null为初级中文大写、1为顶级中文大写

• @returns {string}
  /
  Number.prototype.digitToUppercase = function (cnType) {
  var number = Math.round(this * 100) / 100;
  number = number.toString(10).split(".");
  var a = number[0];
  var cn = cnType == 1 ? "零壹贰叁肆伍陆柒捌玖" : "〇一二三四五六七八九";
  var cnNum = "";
  //整数部分
  var len = a.length - 1;
  for (var i = 0; i <= len; i++) {
  cnNum += cnType == 1 ?
  (cn.charAt(parseInt(a.charAt(i))) + [["", "万", "亿", "万"][Math.floor((len - i) / 4)], "拾", "佰", "仟"][(len - i) % 4]) :
  (cn.charAt(parseInt(a.charAt(i))) + [["", "万", "亿", "万"][Math.floor((len - i) / 4)], "十", "百", "千"][(len - i) % 4]);
  }
  //小数部分
  if (number.length == 2 && number[1] != "") {
  var a = number[1];
  cnNum += "点";
  for (var i = 0; i < a.length; i++) {
  cnNum += cn.charAt(parseInt(a.charAt(i)));
  }
  }
  / 一些通俗数字读法的格式处理 /
  if (cnType == 1) {
  cnNum = cnNum.replace(/零佰|零拾|零仟/g, "零");
  cnNum = cnNum.replace(/零{2,}/g, "零");
  if (!/^零点.+$/.test(cnNum)) {
  cnNum = cnNum.replace(/零点/g, "点");
  }
  if (/^壹拾.+$/.test(cnNum)) {
  cnNum = cnNum.replace(/壹拾/g, "拾");
  }
  } else {
  cnNum = cnNum.replace(/〇百|〇十|〇千/g, "〇");
  cnNum = cnNum.replace(/〇{2,}/g, "〇");
  if (!/^〇点.+$/.test(cnNum)) {
  cnNum = cnNum.replace(/〇点/g, "点");
  }
  if (/^一十.+$/.test(cnNum)) {
  cnNum = cnNum.replace(/一十/g, "十");
  }
  }
  cnNum = cnNum.replace(/(〇|零)(?=万|亿)/g, "");
  cnNum = cnNum.replace(/亿万/, "亿");
  cnNum = cnNum.replace(/(〇|零)$/, "");
  return cnNum;
  };
  /*

• 四舍五入
  */
  Number.prototype.toRound = function() {
  var num=Math.round(this);
  return num;
  };

/**

• 转换为小数
• @param n 保留n位小数
  */
  Number.prototype.toDecimal = function(n) {
  var num=Number(this.toFixed(n));
  return num;
  };

/**

• 转换为万元单位
  */
  Number.prototype.toMillion = function() {
  var num=Math.round(this);
  if(num>10000){
  num=num/10000;
  var pattern = '#,###,###';
  num= num.format(pattern)+'w';
  }
  return num;
  }