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
Numeral.js-一个JavaScript库，通过@adamwdraper轻松设置数字格式
numeral(23456.789).format('$0,0.00'); // = "$23,456.79"
其他回答
PHP函数“number_format”有一个JavaScript端口。
我发现它非常有用，因为它易于使用，并且对PHP开发人员来说是可识别的。
function number_format (number, decimals, dec_point, thousands_sep) {
var n = number, prec = decimals;
var toFixedFix = function (n,prec) {
var k = Math.pow(10,prec);
return (Math.round(n*k)/k).toString();
};
n = !isFinite(+n) ? 0 : +n;
prec = !isFinite(+prec) ? 0 : Math.abs(prec);
var sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep;
var dec = (typeof dec_point === 'undefined') ? '.' : dec_point;
var s = (prec > 0) ? toFixedFix(n, prec) : toFixedFix(Math.round(n), prec);
// Fix for Internet Explorer parseFloat(0.55).toFixed(0) = 0;
var abs = toFixedFix(Math.abs(n), prec);
var _, i;
if (abs >= 1000) {
_ = abs.split(/\D/);
i = _[0].length % 3 || 3;
_[0] = s.slice(0,i + (n < 0)) +
_[0].slice(i).replace(/(\d{3})/g, sep+'$1');
s = _.join(dec);
} else {
s = s.replace('.', dec);
}
var decPos = s.indexOf(dec);
if (prec >= 1 && decPos !== -1 && (s.length-decPos-1) < prec) {
s += new Array(prec-(s.length-decPos-1)).join(0)+'0';
}
else if (prec >= 1 && decPos === -1) {
s += dec+new Array(prec).join(0)+'0';
}
return s;
}
（原文注释栏，包括以下示例和到期信用）
// Formats a number with grouped thousands
//
// version: 906.1806
// discuss at: http://phpjs.org/functions/number_format
// + original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + bugfix by: Michael White (http://getsprink.com)
// + bugfix by: Benjamin Lupton
// + bugfix by: Allan Jensen (http://www.winternet.no)
// + revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
// + bugfix by: Howard Yeend
// + revised by: Luke Smith (http://lucassmith.name)
// + bugfix by: Diogo Resende
// + bugfix by: Rival
// + input by: Kheang Hok Chin (http://www.distantia.ca/)
// + improved by: davook
// + improved by: Brett Zamir (http://brett-zamir.me)
// + input by: Jay Klehr
// + improved by: Brett Zamir (http://brett-zamir.me)
// + input by: Amir Habibi (http://www.residence-mixte.com/)
// + bugfix by: Brett Zamir (http://brett-zamir.me)
// * 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'
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;
};
一种仅满足原始要求的极简方法：
function formatMoney(n) {
return "$ " + (Math.round(n * 100) / 100).toLocaleString();
}
@丹尼尔·马格廖拉：你说得对。以上是一个仓促而不完整的实施。以下是正确的实施方式：
function formatMoney(n) {
return "$ " + n.toLocaleString().split(".")[0] + "."
+ n.toFixed(2).split(".")[1];
}
function getMoney(A){
var a = new Number(A);
var b = a.toFixed(2); // Get 12345678.90
a = parseInt(a); // Get 12345678
b = (b-a).toPrecision(2); // Get 0.90
b = parseFloat(b).toFixed(2); // In case we get 0.0, we pad it out to 0.00
a = a.toLocaleString(); // Put in commas - Internet Explorer also puts in .00, so we'll get 12,345,678.00
// If Internet Explorer (our number ends in .00)
if(a < 1 && a.lastIndexOf('.00') == (a.length - 3))
{
a = a.substr(0, a.length-3); // Delete the .00
}
return a + b.substr(1); // Remove the 0 from b, then return a + b = 12,345,678.90
}
alert(getMoney(12345678.9));
这适用于Firefox和Internet Explorer。
主要部分是插入千个分隔符，可以这样做：
<script type="text/javascript">
function ins1000Sep(val) {
val = val.split(".");
val[0] = val[0].split("").reverse().join("");
val[0] = val[0].replace(/(\d{3})/g, "$1,");
val[0] = val[0].split("").reverse().join("");
val[0] = val[0].indexOf(",") == 0 ? val[0].substring(1) : val[0];
return val.join(".");
}
function rem1000Sep(val) {
return val.replace(/,/g, "");
}
function formatNum(val) {
val = Math.round(val*100)/100;
val = ("" + val).indexOf(".") > -1 ? val + "00" : val + ".00";
var dec = val.indexOf(".");
return dec == val.length-3 || dec == 0 ? val : val.substring(0, dec+3);
}
</script>
<button onclick="alert(ins1000Sep(formatNum(12313231)));">
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