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
我主要基于VisionN的回答:
function format (val) {
val = (+val).toLocaleString();
val = (+val).toFixed(2);
val += "";
return val.replace(/(\d)(?=(\d{3})+(?:\.\d+)?$)/g, "$1" + format.thousands);
}
(function (isUS) {
format.decimal = isUS ? "." : ",";
format.thousands = isUS ? "," : ".";
}(("" + (+(0.00).toLocaleString()).toFixed(2)).indexOf(".") > 0));
我用输入进行了测试:
[ ""
, "1"
, "12"
, "123"
, "1234"
, "12345"
, "123456"
, "1234567"
, "12345678"
, "123456789"
, "1234567890"
, ".12"
, "1.12"
, "12.12"
, "123.12"
, "1234.12"
, "12345.12"
, "123456.12"
, "1234567.12"
, "12345678.12"
, "123456789.12"
, "1234567890.12"
, "1234567890.123"
, "1234567890.125"
].forEach(function (item) {
console.log(format(item));
});
得到了这些结果:
0.00
1.00
12.00
123.00
1,234.00
12,345.00
123,456.00
1,234,567.00
12,345,678.00
123,456,789.00
1,234,567,890.00
0.12
1.12
12.12
123.12
1,234.12
12,345.12
123,456.12
1,234,567.12
12,345,678.12
123,456,789.12
1,234,567,890.12
1,234,567,890.12
1,234,567,890.13
只是为了好玩。
其他回答
使用正则表达式的较短方法(用于插入空格、逗号或点):
Number.prototype.toCurrencyString = function(){
return this.toFixed(2).replace(/(\d)(?=(\d{3})+\b)/g, '$1 ');
}
n = 12345678.9;
alert(n.toCurrencyString());
这是另一个尝试,只是为了好玩:
function formatDollar(num) {
var p = num.toFixed(2).split(".");
return "$" + p[0].split("").reverse().reduce(function(acc, num, i, orig) {
return num + (num != "-" && i && !(i % 3) ? "," : "") + acc;
}, "") + "." + p[1];
}
还有一些测试:
formatDollar(45664544.23423) // "$45,664,544.23"
formatDollar(45) // "$45.00"
formatDollar(123) // "$123.00"
formatDollar(7824) // "$7,824.00"
formatDollar(1) // "$1.00"
formatDollar(-1345) // "$-1,345.00
formatDollar(-3) // "$-3.00"
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。
一个简单的选项,通过先反转字符串和基本正则表达式来正确放置逗号。
String.prototype.reverse = function() {
return this.split('').reverse().join('');
};
Number.prototype.toCurrency = function( round_decimal /*boolean*/ ) {
// format decimal or round to nearest integer
var n = this.toFixed( round_decimal ? 0 : 2 );
// convert to a string, add commas every 3 digits from left to right
// by reversing string
return (n + '').reverse().replace( /(\d{3})(?=\d)/g, '$1,' ).reverse();
};
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;
}