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?
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
这里是我见过的最好的JavaScript货币格式化程序:
Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator) {
var n = this,
decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
decSeparator = decSeparator == undefined ? "." : decSeparator,
thouSeparator = thouSeparator == undefined ? "," : thouSeparator,
sign = n < 0 ? "-" : "",
i = parseInt(n = Math.abs(+n || 0).toFixed(decPlaces)) + "",
j = (j = i.length) > 3 ? j % 3 : 0;
return sign + (j ? i.substr(0, j) + thouSeparator : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thouSeparator) + (decPlaces ? decSeparator + Math.abs(n - i).toFixed(decPlaces).slice(2) : "");
};
它被重新格式化并从这里借用:如何将数字格式化为货币字符串
您必须提供您自己的货币代号(您使用了$以上)。
这样调用它(尽管注意,参数默认为2、逗号和句点,因此如果这是您的首选,则不需要提供任何参数):
var myMoney = 3543.75873;
var formattedMoney = '$' + myMoney.formatMoney(2, ',', '.'); // "$3,543.76"
其他回答
http://code.google.com/p/javascript-number-formatter/:
短、快、灵活但独立。只有75行,包括MIT许可证信息、空白行和注释。接受标准数字格式,如#、##0.00或带否定的-000.####。接受任何国家/地区格式,如###0,00,#,###.##,#‘###.##或任何类型的非编号符号。接受任意数字分组。#、##、#0.000或#、####0.##均有效。接受任何冗余/防傻瓜格式。##、###、##。#或0#、#00####0#都正常。自动数字舍入。简单的界面,只需提供如下掩码和值:格式(“0.0000”,3.141592)
UPDATE这是我自己开发的应用程序,用于最常见的任务:
var NumUtil = {};
/**
Petty print 'num' wth exactly 'signif' digits.
pp(123.45, 2) == "120"
pp(0.012343, 3) == "0.0123"
pp(1.2, 3) == "1.20"
*/
NumUtil.pp = function(num, signif) {
if (typeof(num) !== "number")
throw 'NumUtil.pp: num is not a number!';
if (isNaN(num))
throw 'NumUtil.pp: num is NaN!';
if (num < 1e-15 || num > 1e15)
return num;
var r = Math.log(num)/Math.LN10;
var dot = Math.floor(r) - (signif-1);
r = r - Math.floor(r) + (signif-1);
r = Math.round(Math.exp(r * Math.LN10)).toString();
if (dot >= 0) {
for (; dot > 0; dot -= 1)
r += "0";
return r;
} else if (-dot >= r.length) {
var p = "0.";
for (; -dot > r.length; dot += 1) {
p += "0";
}
return p+r;
} else {
return r.substring(0, r.length + dot) + "." + r.substring(r.length + dot);
}
}
/** Append leading zeros up to 2 digits. */
NumUtil.align2 = function(v) {
if (v < 10)
return "0"+v;
return ""+v;
}
/** Append leading zeros up to 3 digits. */
NumUtil.align3 = function(v) {
if (v < 10)
return "00"+v;
else if (v < 100)
return "0"+v;
return ""+v;
}
NumUtil.integer = {};
/** Round to integer and group by 3 digits. */
NumUtil.integer.pp = function(num) {
if (typeof(num) !== "number") {
console.log("%s", new Error().stack);
throw 'NumUtil.integer.pp: num is not a number!';
}
if (isNaN(num))
throw 'NumUtil.integer.pp: num is NaN!';
if (num > 1e15)
return num;
if (num < 0)
throw 'Negative num!';
num = Math.round(num);
var group = num % 1000;
var integ = Math.floor(num / 1000);
if (integ === 0) {
return group;
}
num = NumUtil.align3(group);
while (true) {
group = integ % 1000;
integ = Math.floor(integ / 1000);
if (integ === 0)
return group + " " + num;
num = NumUtil.align3(group) + " " + num;
}
return num;
}
NumUtil.currency = {};
/** Round to coins and group by 3 digits. */
NumUtil.currency.pp = function(amount) {
if (typeof(amount) !== "number")
throw 'NumUtil.currency.pp: amount is not a number!';
if (isNaN(amount))
throw 'NumUtil.currency.pp: amount is NaN!';
if (amount > 1e15)
return amount;
if (amount < 0)
throw 'Negative amount!';
if (amount < 1e-2)
return 0;
var v = Math.round(amount*100);
var integ = Math.floor(v / 100);
var frac = NumUtil.align2(v % 100);
var group = integ % 1000;
integ = Math.floor(integ / 1000);
if (integ === 0) {
return group + "." + frac;
}
amount = NumUtil.align3(group);
while (true) {
group = integ % 1000;
integ = Math.floor(integ / 1000);
if (integ === 0)
return group + " " + amount + "." + frac;
amount = NumUtil.align3(group) + " " + amount;
}
return amount;
}
我想为此做出贡献:
function toMoney(amount) {
neg = amount.charAt(0);
amount = amount.replace(/\D/g, '');
amount = amount.replace(/\./g, '');
amount = amount.replace(/\-/g, '');
var numAmount = new Number(amount);
amount = numAmount.toFixed(0).replace(/./g, function(c, i, a) {
return i > 0 && c !== "," && (a.length - i) % 3 === 0 ? "." + c : c;
});
if(neg == '-')
return neg + amount;
else
return amount;
}
这允许您在一个文本框中转换数字,在该文本框中您只需要输入数字(考虑这种情况)。
这将清理一个文本框,其中只有数字,即使你粘贴了一个包含数字、字母或任何字符的字符串
<html>
<head>
<script language=="Javascript">
function isNumber(evt) {
var theEvent = evt || window.event;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode(key);
if (key.length == 0)
return;
var regex = /^[0-9\-\b]+$/;
if (!regex.test(key)) {
theEvent.returnValue = false;
if (theEvent.preventDefault)
theEvent.preventDefault();
}
}
function toMoney(amount) {
neg = amount.charAt(0);
amount = amount.replace(/\D/g, '');
amount = amount.replace(/\./g, '');
amount = amount.replace(/\-/g, '');
var numAmount = new Number(amount);
amount = numAmount.toFixed(0).replace(/./g, function(c, i, a) {
return i > 0 && c !== "," && (a.length - i) % 3 === 0 ? "." + c : c;
});
if(neg == '-')
return neg + amount;
else
return amount;
}
function clearText(inTxt, newTxt, outTxt) {
inTxt = inTxt.trim();
newTxt = newTxt.trim();
if(inTxt == '' || inTxt == newTxt)
return outTxt;
return inTxt;
}
function fillText(inTxt, outTxt) {
inTxt = inTxt.trim();
if(inTxt != '')
outTxt = inTxt;
return outTxt;
}
</script>
</head>
<body>
$ <input name=reca2 id=reca2 type=text value="0" onFocus="this.value = clearText(this.value, '0', '');" onblur="this.value = fillText(this.value, '0'); this.value = toMoney(this.value);" onKeyPress="isNumber(event);" style="width:80px;" />
</body>
</html>
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"
tggagne是正确的。由于浮动舍入,我下面的解决方案不好。toLocaleString函数缺少一些浏览器支持。出于存档目的,我将留下以下评论,说明不该做什么。:)
Date.product.toLocaleString()
(旧解决方案)使用Patrick Desjardins的解决方案。
这是一个简洁的解决方案,它使用toLocaleString(),自JavaScript 1.0版以来一直支持该解决方案。此示例将货币指定为美元,但可以使用“GBP”而不是“USD”转换为英镑。
var formatMoney = function (value) {
// Convert the value to a floating point number in case it arrives as a string.
var numeric = parseFloat(value);
// Specify the local currency.
return numeric.toLocaleString('USD', { style: 'currency', currency: "USD", minimumFractionDigits: 2, maximumFractionDigits: 2 });
}
有关更多详细信息,请参阅国际化和本地化,货币。
YUI代码库使用以下格式:
format: function(nData, oConfig) {
oConfig = oConfig || {};
if(!YAHOO.lang.isNumber(nData)) {
nData *= 1;
}
if(YAHOO.lang.isNumber(nData)) {
var sOutput = nData + "";
var sDecimalSeparator = (oConfig.decimalSeparator) ? oConfig.decimalSeparator : ".";
var nDotIndex;
// Manage decimals
if(YAHOO.lang.isNumber(oConfig.decimalPlaces)) {
// Round to the correct decimal place
var nDecimalPlaces = oConfig.decimalPlaces;
var nDecimal = Math.pow(10, nDecimalPlaces);
sOutput = Math.round(nData*nDecimal)/nDecimal + "";
nDotIndex = sOutput.lastIndexOf(".");
if(nDecimalPlaces > 0) {
// Add the decimal separator
if(nDotIndex < 0) {
sOutput += sDecimalSeparator;
nDotIndex = sOutput.length-1;
}
// Replace the "."
else if(sDecimalSeparator !== "."){
sOutput = sOutput.replace(".",sDecimalSeparator);
}
// Add missing zeros
while((sOutput.length - 1 - nDotIndex) < nDecimalPlaces) {
sOutput += "0";
}
}
}
// Add the thousands separator
if(oConfig.thousandsSeparator) {
var sThousandsSeparator = oConfig.thousandsSeparator;
nDotIndex = sOutput.lastIndexOf(sDecimalSeparator);
nDotIndex = (nDotIndex > -1) ? nDotIndex : sOutput.length;
var sNewOutput = sOutput.substring(nDotIndex);
var nCount = -1;
for (var i=nDotIndex; i>0; i--) {
nCount++;
if ((nCount%3 === 0) && (i !== nDotIndex)) {
sNewOutput = sThousandsSeparator + sNewOutput;
}
sNewOutput = sOutput.charAt(i-1) + sNewOutput;
}
sOutput = sNewOutput;
}
// Prepend prefix
sOutput = (oConfig.prefix) ? oConfig.prefix + sOutput : sOutput;
// Append suffix
sOutput = (oConfig.suffix) ? sOutput + oConfig.suffix : sOutput;
return sOutput;
}
// Still not a number. Just return it unaltered
else {
return nData;
}
}
它需要编辑,因为YUI库是可配置的,比如用“.”替换oConfig.decimalSeparator。