我想用JavaScript格式化价格。我想要一个函数,它将浮点作为参数,并返回如下格式的字符串:

"$ 2,500.00"

我该怎么做?


当前回答

String.prototype.toPrice = function () {
    var v;
    if (/^\d+(,\d+)$/.test(this))
        v = this.replace(/,/, '.');
    else if (/^\d+((,\d{3})*(\.\d+)?)?$/.test(this))
        v = this.replace(/,/g, "");
    else if (/^\d+((.\d{3})*(,\d+)?)?$/.test(this))
        v = this.replace(/\./g, "").replace(/,/, ".");
    var x = parseFloat(v).toFixed(2).toString().split("."),
    x1 = x[0],
    x2 = ((x.length == 2) ? "." + x[1] : ".00"),
    exp = /^([0-9]+)(\d{3})/;
    while (exp.test(x1))
        x1 = x1.replace(exp, "$1" + "," + "$2");
    return x1 + x2;
}

alert("123123".toPrice()); //123,123.00
alert("123123,316".toPrice()); //123,123.32
alert("12,312,313.33213".toPrice()); //12,312,313.33
alert("123.312.321,32132".toPrice()); //123,312,321.32

其他回答

我们也可以使用numeraljs

数字的格式可以像货币、百分比、时间,甚至是带有小数位数、千位和缩写的普通数字。您可以始终创建自定义格式。

var string = numeral(1000).format('0,0');
// '1,000'

请在下面的代码中找到我为支持国际化而开发的内容。

它将给定的数值格式化为特定于语言的格式。在给定的示例中,我使用了“en”,同时测试了“es”、“fr”和其他格式不同的国家。它不仅可以阻止用户键入字符,还可以格式化制表符上的值。

我已经为数字和十进制格式创建了组件。除此之外,我还创建了parseNumber(value,locale)和parseDecimal(value,locale)函数,这些函数将解析格式化数据以用于任何其他业务目的。所述函数将接受格式化数据并返回非格式化值。我在下面的共享代码中使用了jQuery验证器插件。

HTML格式:

<tr>
    <td>
        <label class="control-label">
            Number Field:
        </label>
        <div class="inner-addon right-addon">
            <input type="text" id="numberField"
                   name="numberField"
                   class="form-control"
                   autocomplete="off"
                   maxlength="17"
                   data-rule-required="true"
                   data-msg-required="Cannot be blank."
                   data-msg-maxlength="Exceeding the maximum limit of 13 digits. Example: 1234567890123"
                   data-rule-numberExceedsMaxLimit="en"
                   data-msg-numberExceedsMaxLimit="Exceeding the maximum limit of 13 digits. Example: 1234567890123"
                   onkeydown="return isNumber(event, 'en')"
                   onkeyup="return updateField(this)"
                   onblur="numberFormatter(this,
                               'en',
                               'Invalid character(s) found. Please enter valid characters.')">
        </div>
    </td>
</tr>

<tr>
    <td>
        <label class="control-label">
            Decimal Field:
        </label>
        <div class="inner-addon right-addon">
            <input type="text" id="decimalField"
                   name="decimalField"
                   class="form-control"
                   autocomplete="off"
                   maxlength="20"
                   data-rule-required="true"
                   data-msg-required="Cannot be blank."
                   data-msg-maxlength="Exceeding the maximum limit of 16 digits. Example: 1234567890123.00"
                   data-rule-decimalExceedsMaxLimit="en"
                   data-msg-decimalExceedsMaxLimit="Exceeding the maximum limit of 16 digits. Example: 1234567890123.00"
                   onkeydown="return isDecimal(event, 'en')"
                   onkeyup="return updateField(this)"
                   onblur="decimalFormatter(this,
                       'en',
                       'Invalid character(s) found. Please enter valid characters.')">
        </div>
    </td>
</tr>

JavaScript:

/*
 * @author: dinesh.lomte
 */
/* Holds the maximum limit of digits to be entered in number field. */
var numericMaxLimit = 13;
/* Holds the maximum limit of digits to be entered in decimal field. */
var decimalMaxLimit = 16;

/**
 *
 * @param {type} value
 * @param {type} locale
 * @returns {Boolean}
 */
parseDecimal = function(value, locale) {

    value = value.trim();
    if (isNull(value)) {
        return 0.00;
    }
    if (isNull(locale)) {
        return value;
    }
    if (getNumberFormat(locale)[0] === '.') {
        value = value.replace(/\./g, '');
    } else {
        value = value.replace(
                    new RegExp(getNumberFormat(locale)[0], 'g'), '');
    }
    if (getNumberFormat(locale)[1] === ',') {
        value = value.replace(
                    new RegExp(getNumberFormat(locale)[1], 'g'), '.');
    }
    return value;
};

/**
 *
 * @param {type} element
 * @param {type} locale
 * @param {type} nanMessage
 * @returns {Boolean}
 */
decimalFormatter = function (element, locale, nanMessage) {

    showErrorMessage(element.id, false, null);
    if (isNull(element.id) || isNull(element.value) || isNull(locale)) {
        return true;
    }
    var value = element.value.trim();
    value = value.replace(/\s/g, '');
    value = parseDecimal(value, locale);
    var numberFormatObj = new Intl.NumberFormat(locale,
            {   minimumFractionDigits: 2,
                maximumFractionDigits: 2
            }
    );
    if (numberFormatObj.format(value) === 'NaN') {
        showErrorMessage(element.id, true, nanMessage);
        setFocus(element.id);
        return false;
    }
    element.value = numberFormatObj.format(value);
    return true;
};

/**
 *
 * @param {type} element
 * @param {type} locale
 * @param {type} nanMessage
 * @returns {Boolean}
 */
numberFormatter = function (element, locale, nanMessage) {

    showErrorMessage(element.id, false, null);
    if (isNull(element.id) || isNull(element.value) || isNull(locale)) {
        return true;
    }
    var value = element.value.trim();
    var format = getNumberFormat(locale);
    if (hasDecimal(value, format[1])) {
        showErrorMessage(element.id, true, nanMessage);
        setFocus(element.id);
        return false;
    }
    value = value.replace(/\s/g, '');
    value = parseNumber(value, locale);
    var numberFormatObj = new Intl.NumberFormat(locale,
            {   minimumFractionDigits: 0,
                maximumFractionDigits: 0
            }
    );
    if (numberFormatObj.format(value) === 'NaN') {
        showErrorMessage(element.id, true, nanMessage);
        setFocus(element.id);
        return false;
    }
    element.value =
            numberFormatObj.format(value);
    return true;
};

/**
 *
 * @param {type} id
 * @param {type} flag
 * @param {type} message
 * @returns {undefined}
 */
showErrorMessage = function(id, flag, message) {

    if (flag) {
        // only add if not added
        if ($('#'+id).parent().next('.app-error-message').length === 0) {
            var errorTag = '<div class=\'app-error-message\'>' + message + '</div>';
            $('#'+id).parent().after(errorTag);
        }
    } else {
        // remove it
        $('#'+id).parent().next(".app-error-message").remove();
    }
};

/**
 *
 * @param {type} id
 * @returns
 */
setFocus = function(id) {

    id = id.trim();
    if (isNull(id)) {
        return;
    }
    setTimeout(function() {
        document.getElementById(id).focus();
    }, 10);
};

/**
 *
 * @param {type} value
 * @param {type} locale
 * @returns {Array}
 */
parseNumber = function(value, locale) {

    value = value.trim();
    if (isNull(value)) {
        return 0;
    }
    if (isNull(locale)) {
        return value;
    }
    if (getNumberFormat(locale)[0] === '.') {
        return value.replace(/\./g, '');
    }
    return value.replace(
        new RegExp(getNumberFormat(locale)[0], 'g'), '');
};

/**
 *
 * @param {type} locale
 * @returns {Array}
 */
getNumberFormat = function(locale) {

    var format = [];
    var numberFormatObj = new Intl.NumberFormat(locale,
            {   minimumFractionDigits: 2,
                maximumFractionDigits: 2
            }
    );
    var value = numberFormatObj.format('132617.07');
    format[0] = value.charAt(3);
    format[1] = value.charAt(7);
    return format;
};

/**
 *
 * @param {type} value
 * @param {type} fractionFormat
 * @returns {Boolean}
 */
hasDecimal = function(value, fractionFormat) {

    value = value.trim();
    if (isNull(value) || isNull(fractionFormat)) {
        return false;
    }
    if (value.indexOf(fractionFormat) >= 1) {
        return true;
    }
};

/**
 *
 * @param {type} event
 * @param {type} locale
 * @returns {Boolean}
 */
isNumber = function(event, locale) {

    var keyCode = event.which ? event.which : event.keyCode;
    // Validating if user has pressed shift character
    if (keyCode === 16) {
        return false;
    }
    if (isNumberKey(keyCode)) {
        return true;
    }
    var numberFormatter = [32, 110, 188, 190];
    if (keyCode === 32
            && isNull(getNumberFormat(locale)[0]) === isNull(getFormat(keyCode))) {
        return true;
    }
    if (numberFormatter.indexOf(keyCode) >= 0
            && getNumberFormat(locale)[0] === getFormat(keyCode)) {
        return true;
    }
    return false;
};

/**
 *
 * @param {type} event
 * @param {type} locale
 * @returns {Boolean}
 */
isDecimal = function(event, locale) {

    var keyCode = event.which ? event.which : event.keyCode;
    // Validating if user has pressed shift character
    if (keyCode === 16) {
        return false;
    }
    if (isNumberKey(keyCode)) {
        return true;
    }
    var numberFormatter = [32, 110, 188, 190];
    if (keyCode === 32
            && isNull(getNumberFormat(locale)[0]) === isNull(getFormat(keyCode))) {
        return true;
    }
    if (numberFormatter.indexOf(keyCode) >= 0
            && (getNumberFormat(locale)[0] === getFormat(keyCode)
                || getNumberFormat(locale)[1] === getFormat(keyCode))) {
        return true;
    }
    return false;
};

/**
 *
 * @param {type} keyCode
 * @returns {Boolean}
 */
isNumberKey = function(keyCode) {

    if ((keyCode >= 48 && keyCode <= 57) ||
        (keyCode >= 96 && keyCode <= 105)) {
        return true;
    }
    var keys = [8, 9, 13, 35, 36, 37, 39, 45, 46, 109, 144, 173, 189];
    if (keys.indexOf(keyCode) !== -1) {
        return true;
    }
    return false;
};

/**
 *
 * @param {type} keyCode
 * @returns {JSON@call;parse.numberFormatter.value|String}
 */
getFormat = function(keyCode) {

    var jsonString = '{"numberFormatter" : [{"key":"32", "value":" ", "description":"space"}, {"key":"188", "value":",", "description":"comma"}, {"key":"190", "value":".", "description":"dot"}, {"key":"110", "value":".", "description":"dot"}]}';
    var jsonObject = JSON.parse(jsonString);
    for (var key in jsonObject.numberFormatter) {
        if (jsonObject.numberFormatter.hasOwnProperty(key)
                && keyCode === parseInt(jsonObject.numberFormatter[key].key)) {
            return jsonObject.numberFormatter[key].value;
        }
    }
    return '';
};

/**
 *
 * @type String
 */
var jsonString = '{"shiftCharacterNumberMap" : [{"char":")", "number":"0"}, {"char":"!", "number":"1"}, {"char":"@", "number":"2"}, {"char":"#", "number":"3"}, {"char":"$", "number":"4"}, {"char":"%", "number":"5"}, {"char":"^", "number":"6"}, {"char":"&", "number":"7"}, {"char":"*", "number":"8"}, {"char":"(", "number":"9"}]}';

/**
 *
 * @param {type} value
 * @returns {JSON@call;parse.shiftCharacterNumberMap.number|String}
 */
getShiftCharSpecificNumber = function(value) {

    var jsonObject = JSON.parse(jsonString);
    for (var key in jsonObject.shiftCharacterNumberMap) {
        if (jsonObject.shiftCharacterNumberMap.hasOwnProperty(key)
                && value === jsonObject.shiftCharacterNumberMap[key].char) {
            return jsonObject.shiftCharacterNumberMap[key].number;
        }
    }
    return '';
};

/**
 *
 * @param {type} value
 * @returns {Boolean}
 */
isShiftSpecificChar = function(value) {

    var jsonObject = JSON.parse(jsonString);
    for (var key in jsonObject.shiftCharacterNumberMap) {
        if (jsonObject.shiftCharacterNumberMap.hasOwnProperty(key)
                && value === jsonObject.shiftCharacterNumberMap[key].char) {
            return true;
        }
    }
    return false;
};

/**
 *
 * @param {type} element
 * @returns {undefined}
 */
updateField = function(element) {

    var value = element.value;

    for (var index = 0; index < value.length; index++) {
        if (!isShiftSpecificChar(value.charAt(index))) {
            continue;
        }
        element.value = value.replace(
                value.charAt(index),
                getShiftCharSpecificNumber(value.charAt(index)));
    }
};

/**
 *
 * @param {type} value
 * @param {type} element
 * @param {type} params
 */
jQuery.validator.addMethod('numberExceedsMaxLimit', function(value, element, params) {

    value = parseInt(parseNumber(value, params));
    if (value.toString().length > numericMaxLimit) {
        showErrorMessage(element.id, false, null);
        setFocus(element.id);
        return false;
    }
    return true;
}, 'Exceeding the maximum limit of 13 digits. Example: 1234567890123.');

/**
 *
 * @param {type} value
 * @param {type} element
 * @param {type} params
 */
jQuery.validator.addMethod('decimalExceedsMaxLimit', function(value, element, params) {

    value = parseFloat(parseDecimal(value, params)).toFixed(2);
    if (value.toString().substring(
            0, value.toString().lastIndexOf('.')).length > numericMaxLimit
            || value.toString().length > decimalMaxLimit) {
        showErrorMessage(element.id, false, null);
        setFocus(element.id);
        return false;
    }
    return true;
}, 'Exceeding the maximum limit of 16 digits. Example: 1234567890123.00.');

/**
 * @param {type} id
 * @param {type} locale
 * @returns {boolean}
 */
isNumberExceedMaxLimit = function(id, locale) {

    var value = parseInt(parseNumber(
            document.getElementById(id).value, locale));
    if (value.toString().length > numericMaxLimit) {
        setFocus(id);
        return true;
    }
    return false;
};

/**
 * @param {type} id
 * @param {type} locale
 * @returns {boolean}
 */
isDecimalExceedsMaxLimit = function(id, locale) {

    var value = parseFloat(parseDecimal(
            document.getElementById(id).value, locale)).toFixed(2);
    if (value.toString().substring(
            0, value.toString().lastIndexOf('.')).length > numericMaxLimit
            || value.toString().length > decimalMaxLimit) {
        setFocus(id);
        return true;
    }
    return false;
};

我喜欢简单:

function formatPriceUSD(price) {
    var strPrice = price.toFixed(2).toString();
    var a = strPrice.split('');

    if (price > 1000000000)
        a.splice(a.length - 12, 0, ',');

    if (price > 1000000)
        a.splice(a.length - 9, 0, ',');

    if (price > 1000)
        a.splice(a.length - 6, 0, ',');

    return '$' + a.join("");
}

许多答案都有有益的想法,但没有一个能满足我的需求。所以我使用了所有的想法,并构建了这个示例:

function Format_Numb(fmt){
    var decimals = isNaN(decimals) ? 2 : Math.abs(decimals);
    if(typeof decSgn === "undefined") decSgn = ".";
    if(typeof kommaSgn === "undefined") kommaSgn= ",";

    var s3digits = /(\d{1,3}(?=(\d{3})+(?=[.]|$))|(?:[.]\d*))/g;
    var dflt_nk = "00000000".substring(0, decimals);

    //--------------------------------
    // handler for pattern: "%m"
    var _f_money = function(v_in){
                       var v = v_in.toFixed(decimals);
                       var add_nk = ",00";
                       var arr = v.split(".");
                       return arr[0].toString().replace(s3digits, function ($0) {
                           return ($0.charAt(0) == ".")
                                   ? ((add_nk = ""), (kommaSgn + $0.substring(1)))
                                   : ($0 + decSgn);
                           })
                           + ((decimals > 0)
                                 ? (kommaSgn
                                       + (
                                           (arr.length > 1)
                                           ? arr[1]
                                           : dflt_nk
                                       )
                                   )
                                 : ""
                           );
                   }

    // handler for pattern: "%<len>[.<prec>]f"
    var _f_flt = function(v_in, l, prec){
        var v = (typeof prec !== "undefined") ? v_in.toFixed(prec) : v_in;
        return ((typeof l !== "undefined") && ((l=l-v.length) > 0))
                ? (Array(l+1).join(" ") + v)
                : v;
    }

    // handler for pattern: "%<len>x"
    var _f_hex = function(v_in, l, flUpper){
        var v = Math.round(v_in).toString(16);
        if(flUpper) v = v.toUpperCase();
        return ((typeof l !== "undefined") && ((l=l-v.length) > 0))
                ? (Array(l+1).join("0") + v)
                : v;
    }

    //...can be extended..., just add the function, for example:    var _f_octal = function( v_in,...){
    //--------------------------------

    if(typeof(fmt) !== "undefined"){
        //...can be extended..., just add the char, for example "O":    MFX -> MFXO
        var rpatt = /(?:%([^%"MFX]*)([MFX]))|(?:"([^"]*)")|("|%%)/gi;
        var _qu = "\"";
        var _mask_qu = "\\\"";
        var str = fmt.toString().replace(rpatt, function($0, $1, $2, $3, $4){
                      var f;
                      if(typeof $1 !== "undefined"){
                          switch($2.toUpperCase()){
                              case "M": f = "_f_money(v)";    break;

                              case "F": var n_dig0, n_dig1;
                                        var re_flt =/^(?:(\d))*(?:[.](\d))*$/;
                                        $1.replace(re_flt, function($0, $1, $2){
                                            n_dig0 = $1;
                                            n_dig1 = $2;
                                        });
                                        f = "_f_flt(v, " + n_dig0 + "," + n_dig1 + ")";    break;

                              case "X": var n_dig = "undefined";
                                        var re_flt = /^(\d*)$/;
                                        $1.replace(re_flt, function($0){
                                            if($0 != "") n_dig = $0;
                                        });
                                        f = "_f_hex(v, " + n_dig + "," + ($2=="X") + ")";    break;
                              //...can be extended..., for example:    case "O":
                          }
                          return "\"+"+f+"+\"";
                      } else if(typeof $3 !== "undefined"){
                          return _mask_qu + $3 + _mask_qu;
                      } else {
                          return ($4 == _qu) ? _mask_qu : $4.charAt(0);
                      }
                  });

        var cmd =     "return function(v){"
                +     "if(typeof v === \"undefined\")return \"\";"  // null returned as empty string
                +     "if(!v.toFixed) return v.toString();"         // not numb returned as string
                +     "return \"" + str + "\";"
                + "}";

        //...can be extended..., just add the function name in the 2 places:
        return new Function("_f_money,_f_flt,_f_hex", cmd)(_f_money,_f_flt,_f_hex);
    }
}

首先,我需要一个C样式格式的字符串定义,它应该是灵活的,但非常容易使用,我用以下方式定义它:;模式:

%[<len>][.<prec>]f   float, example "%f", "%8.2d", "%.3f"
%m                   money
%[<len>]x            hexadecimal lower case, example "%x", "%8x"
%[<len>]X            hexadecimal upper case, example "%X", "%8X"

因为对我来说,除了欧元之外,没有任何其他格式的需要,所以我只实现了“%m”。

但这很容易扩展。。。与C中一样,格式字符串是包含模式的字符串。例如,对于欧元:“%m€”(返回类似“8.129,33€”的字符串)

除了灵活性之外,我还需要一个处理表的快速解决方案。这意味着,在处理数千个单元格时,格式字符串的处理不能重复一次。我不接受类似“format(value,fmt)”的调用,但这必须分为两个步骤:

// var formatter = Format_Numb( "%m €");
// simple example for Euro...

//   but we use a complex example:

var formatter = Format_Numb("a%%%3mxx \"zz\"%8.2f°\"  >0x%8X<");

// formatter is now a function, which can be used more than once (this is an example, that can be tested:)

var v1 = formatter(1897654.8198344);

var v2 = formatter(4.2);

... (and thousands of rows)

同样为了提高性能,_f_money包含正则表达式;

第三,类似“format(value,fmt)”的调用是不可接受的,因为:

虽然可以用不同的掩码格式化不同的对象集合(例如,列的单元格),但我不想在处理时处理格式化字符串。此时,我只想使用格式,如

for(单元格中的var单元格){do_something(cell.col.formatter(cell.value));}

什么格式-可能是在.ini文件中,在XML中为每一列或其他地方定义的。。。,但是分析和设置格式或处理国际化完全是在另一个地方进行的,在那里我想将格式化程序分配给集合,而不考虑性能问题:

col.formatter=格式_字符串(_getFormatForColumn(…));

第四,我想要一个“宽容”的解决方案,因此传递例如字符串而不是数字应该只返回字符串,但“null”应该返回一个空字符串。

(如果值太大,格式化“%4.2f”也不能剪切。)

最后,但并非最不重要的是,它应该是可读的,易于扩展,而不会对性能产生任何影响。。。例如,如果某人需要“八进制值”,请参考带有“…可以扩展…”的行-我认为这应该是一项非常简单的任务。

我的整体重点是表现。每个“处理例程”(例如,_f_money)都可以被封装优化,或者在这个或其他线程中与其他思想进行交换,而无需更改“准备例程”(分析格式字符串和创建函数),这些例程只能被处理一次,从这个意义上说,与数千个数字的转换调用相比,性能并不那么关键。

对于所有喜欢数字方法的人来说:

Number.prototype.format_euro = (function(formatter){
    return function(){ return formatter(this); }})
(Format_Numb( "%m €"));

var v_euro = (8192.3282).format_euro(); // results: 8.192,33 €

Number.prototype.format_hex = (function(formatter){
    return function(){ return formatter(this); }})
(Format_Numb( "%4x"));

var v_hex = (4.3282).format_hex();

虽然我测试了一些,但代码中可能有很多错误。因此,它不是一个现成的模块,只是像我这样的非JavaScript专家的一个想法和起点。

该代码包含了许多StackOverflow帖子中修改过的想法;很抱歉,我不能引用所有这些,但感谢所有的专家。

请尝试以下代码

"250000".replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,');

答案:250000