日期：2011/11/10  来源：

Javascript没有任何内建的格式化函数，这里我们通过Google收集了5个javascript的数字格式化函数，希望对于大家的web开发能够带来方便。

十进制四舍五入

这两段代码帮助你做到四舍五入，对于你显示价格或者订单比较有用：

代码1：

function CurrencyFormatted(amount) {
      var i = parseFloat(amount);     if(isNaN(i)) { i = 0.00; }     var minus = '';     if(i < 0) { minus = '-'; }     i = Math.abs(i);     i = parseInt((i + .005) * 100);     i = i / 100;     s = new String(i);     if(s.indexOf('.') < 0) { s += '.00'; }     if(s.indexOf('.') == (s.length - 2)) { s += '0'; }     s = minus + s;     return s; }   /** *   Usage:  CurrencyFormatted(12345.678); *   result: 12345.68 **/

代码2：

function format_number(pnumber,decimals){
      if (isNaN(pnumber)) { return 0};     if (pnumber=='') { return 0};           var snum = new String(pnumber);     var sec = snum.split('.');     var whole = parseFloat(sec[0]);     var result = '';           if(sec.length > 1){
          var dec = new String(sec[1]);         dec = String(parseFloat(sec[1])/Math.pow(10,(dec.length - decimals)));         dec = String(whole + Math.round(parseFloat(dec))/Math.pow(10,decimals));         var dot = dec.indexOf('.');         if(dot == -1){
              dec += '.';             dot = dec.indexOf('.');         }         while(dec.length <= dot + decimals) { dec += '0'; }         result = dec;     } else{
          var dot;         var dec = new String(whole);         dec += '.';         dot = dec.indexOf('.');             while(dec.length <= dot + decimals) { dec += '0'; }         result = dec;     }       return result; }   /** *   Usage:  format_number(12345.678, 2); *   result: 12345.68 **/

添加逗号

这俩段代码帮助你添加逗号到每三位数字中，这让大的数字比较容易查看。

代码1：

 

function CommaFormatted(amount) {

    var delimiter = ","; // replace comma if desired

    amount = new String(amount);

    var a = amount.split('.',2)

    var d = a[1];

    var i = parseInt(a[0]);

    if(isNaN(i)) { return ''; }

    var minus = '';

    if(i < 0) { minus = '-'; }

    i = Math.abs(i);

    var n = new String(i);

    var a = [];

    while(n.length > 3)

    {

        var nn = n.substr(n.length-3);

        a.unshift(nn);

        n = n.substr(0,n.length-3);

    }

    if(n.length > 0) { a.unshift(n); }

    n = a.join(delimiter);

    if(d.length < 1) { amount = n; }

    else { amount = n + '.' + d; }

    amount = minus + amount;

    return amount;

}

 

/**

*   Usage:  CommaFormatted(12345678);

*   result: 12,345,678

**/

代码2：

function addCommas(nStr) {
      nStr += '';     var x = nStr.split('.');     var x1 = x[0];     var x2 = x.length >; 1 ? '.' + x[1] : '';     var rgx = /(d+)(d{3})/;           while (rgx.test(x1)) {
          x1 = x1.replace(rgx, '$1' + ',' + '$2');     }           return x1 + x2; }   /** *   Usage:  addCommas(12345678); *   result: 12,345,678 **/

数字格式化，来自PHP

这段javascript代码功能设计来自PHP的nubmer_format功能。能够四舍五入并且加入逗号分隔。而且可以自定义10进制分隔。

function number_format (number, decimals, dec_point, thousands_sep) {
        number = (number + '').replace(/[^0-9+-Ee.]/g, '');     var n = !isFinite(+number) ? 0 : +number,         prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),         sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep,         dec = (typeof dec_point === 'undefined') ? '.' : dec_point,         s = '',         toFixedFix = function (n, prec) {
              var k = Math.pow(10, prec);             return '' + Math.round(n * k) / k;         };     // Fix for IE parseFloat(0.55).toFixed(0) = 0;     s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.');     if (s[0].length > 3) {
          s[0] = s[0].replace(/B(?=(?:d{3})+(?!d))/g, sep);     }     if ((s[1] || '').length < prec) {
          s[1] = s[1] || '';         s[1] += new Array(prec - s[1].length + 1).join('0');     }     return s.join(dec); }   /** *   Usage:  number_format(123456.789, 2, '.', ','); *   result: 123,456.79 **/

添加一个英文的排序后缀

Number.prototype.toOrdinal = function() {
      var n = this % 100;     var suffix = ['th', 'st', 'nd', 'rd', 'th'];     var ord = n < 21 ? (n < 4 ? suffix[n] : suffix[0]) : (n % 10 > 4 ? suffix[0] : suffix[n % 10]);     return this + ord; }   /* *   Usage: *   var myNumOld = 23 *   var myNumNew = myNumOld.toOrdinal() *   Result: 23rd */

 

除去非数字的字符

function stripNonNumeric( str ) {
    str += '';   var rgx = /^d|.|-$/;   var out = '';   for( var i = 0; i < str.length; i++ )   {
      if( rgx.test( str.charAt(i) ) ){
        if( !( ( str.charAt(i) == '.' && out.indexOf( '.' ) != -1 ) ||              ( str.charAt(i) == '-' && out.length != 0 ) ) ){
          out += str.charAt(i);       }     }   }   return out; }   /* *   Usage: stripNonNumeric('123et45dhs6.789'); *   Result: 123456.789 */

希望对大家有帮助！