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
以下是将数字转换为货币格式的简短最佳方法:
function toCurrency(amount){
return amount.replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
}
// usage: toCurrency(3939920.3030);
其他回答
这里是XMLilley提供的代码的mootools1.2实现。。。
Number.implement('format', function(decPlaces, thouSeparator, decSeparator){
decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces;
decSeparator = decSeparator === undefined ? '.' : decSeparator;
thouSeparator = thouSeparator === undefined ? ',' : thouSeparator;
var num = this,
sign = num < 0 ? '-' : '',
i = parseInt(num = Math.abs(+num || 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(num - i).toFixed(decPlaces).slice(2) : '');
});
已经有好的答案了。这里有一个简单的乐趣尝试:
function currencyFormat(no) {
var ar = (+no).toFixed(2).split('.');
return [
numberFormat(ar[0] | 0),
'.',
ar[1]
].join('');
}
function numberFormat(no) {
var str = no + '';
var ar = [];
var i = str.length -1;
while(i >= 0) {
ar.push((str[i-2] || '') + (str[i-1] || '') + (str[i] || ''));
i = i-3;
}
return ar.reverse().join(',');
}
然后运行一些示例:
console.log(
currencyFormat(1),
currencyFormat(1200),
currencyFormat(123),
currencyFormat(9870000),
currencyFormat(12345),
currencyFormat(123456.232)
)
javascript数字格式化程序(以前在Google Code)
短、快、灵活但独立。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/万无一失的格式。##、###、##。#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)。在掩码中包含前缀和后缀
(摘自自述)
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。
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)));">