Javascript之Number_format

 

// Formats a number with grouped thousands  // *     example 1: number_format(1234.56);// *     returns 1: '1,235'// *     example 2: number_format(1234.56, 2, ',', ' ');// *     returns 2: '1 234,56'// *     example 3: number_format(1234.5678, 2, '.', '');// *     returns 3: '1234.57'// *     example 4: number_format(67, 2, ',', '.');    // *     returns 4: '67,00'// *     example 5: number_format(1000);// *     returns 5: '1,000'// *     example 6: number_format(67.311, 2);// *     returns 6: '67.31'// *     example 7: number_format(1000.55, 1);// *     returns 7: '1,000.6'// *     example 8: number_format(67000, 5, ',', '.');// *     returns 8: '67.000,00000'// *     example 9: number_format(0.9, 0);    // *     returns 9: '1'// *     example 10: number_format('1.20', 2);// *     returns 10: '1.20'// *     example 11: number_format('1.20', 4);// *     returns 11: '1.2000'    // *     example 12: number_format('1.2000', 3);// *     returns 12: '1.200'/** * number_format * * @param int or float number * @param int          decimals * @param string       dec_point * @param string       thousands_sep * @return string */function number_format(number, decimals, dec_point, thousands_sep) {    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);}