5个缺失的 JavaScript 数字格式化函数

时间：2024-01-03 22:47:32
/** 下面两个函数都能对浮点数进行四舍五入，保留小数点后两位 **/

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

**/

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

**/

　　

/** 每三位数字添加一个逗号，方便阅读 **/

function CommaFormatted(amount) {

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

    amount = new String(amount);

    var a = amount.split('.',)

    var d = a[];

    var i = parseInt(a[]);

    if(isNaN(i)) { return ''; }

    var minus = '';

    if(i < ) { minus = '-'; }

    i = Math.abs(i);

    var n = new String(i);

    var a = [];

    while(n.length > )

    {

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

        a.unshift(nn);

        n = n.substr(,n.length-);

    }

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

    n = a.join(delimiter);

    if(d.length < ) { amount = n; }

    else { amount = n + '.' + d; }

    amount = minus + amount;

    return amount;

}

/**

*   Usage:  CommaFormatted(12345678);

*   result: 12,345,678

**/

function addCommas(nStr) {

    nStr += '';

    var x = nStr.split('.');

    var x1 = x[];

    var x2 = x.length >;  ? '.' + x[] : '';

    var rgx = /(d+)(d{})/;

    while (rgx.test(x1)) {

        x1 = x1.replace(rgx, '$1' + ',' + '$2');

    }

    return x1 + x2;

}

/**

*   Usage:  addCommas(12345678);

*   result: 12,345,678

**/
/** 这个函数可以添加分隔逗号或者进行四舍五入。 **/

function number_format (number, decimals, dec_point, thousands_sep) {

    number = (number + '').replace(/[^-+-Ee.]/g, '');

    var n = !isFinite(+number) ?  : +number,

        prec = !isFinite(+decimals) ?  : 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(, 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[].length > ) {

        s[] = s[].replace(/B(?=(?:d{})+(?!d))/g, sep);

    }

    if ((s[] || '').length < prec) {

        s[] = s[] || '';

        s[] += new Array(prec - s[].length + ).join('');

    }

    return s.join(dec);

}

/**

*   Usage:  number_format(123456.789, 2, '.', ',');

*   result: 123,456.79

**/
/** 给数字添加"st, nd, rd, th"等序数词。 **/

Number.prototype.toOrdinal = function() {

    var n = this % ;

    var suffix = ['th', 'st', 'nd', 'rd', 'th'];

    var ord = n <  ? (n <  ? suffix[n] : suffix[]) : (n %  >  ? suffix[] : suffix[n % ]);

    return this + ord;

}

/*

*   Usage:

*   var myNumOld = 23

*   var myNumNew = myNumOld.toOrdinal()

*   Result: 23rd

*/

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