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
我很难找到一个简单的库来处理日期和货币,所以我创建了自己的:https://github.com/dericeira/slimFormatter.js
简单如下:
var number = slimFormatter.currency(2000.54);
其他回答
这里有一些解决方案,都通过了测试套件。包括测试套件和基准测试。如果你想复制和粘贴来测试,试试这个要点。
方法0(RegExp)
它是基于VisioN的答案,但如果没有小数点,它会修复。
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.');
a[0] = a[0].replace(/\d(?=(\d{3})+$)/g, '$&,');
return a.join('.');
}
}
方法1
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.'),
// Skip the '-' sign
head = Number(this < 0);
// Skip the digits that's before the first thousands separator
head += (a[0].length - head) % 3 || 3;
a[0] = a[0].slice(0, head) + a[0].slice(head).replace(/\d{3}/g, ',$&');
return a.join('.');
};
}
方法2(拆分到阵列)
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('.');
a[0] = a[0]
.split('').reverse().join('')
.replace(/\d{3}(?=\d)/g, '$&,')
.split('').reverse().join('');
return a.join('.');
};
}
方法3(循环)
if (typeof Number.prototype.format === 'undefined') {
Number.prototype.format = function (precision) {
if (!isFinite(this)) {
return this.toString();
}
var a = this.toFixed(precision).split('');
a.push('.');
var i = a.indexOf('.') - 3;
while (i > 0 && a[i-1] !== '-') {
a.splice(i, 0, ',');
i -= 3;
}
a.pop();
return a.join('');
};
}
用法示例
console.log('======== Demo ========')
console.log(
(1234567).format(0),
(1234.56).format(2),
(-1234.56).format(0)
);
var n = 0;
for (var i=1; i<20; i++) {
n = (n * 10) + (i % 10)/100;
console.log(n.format(2), (-n).format(2));
}
分离器
如果我们需要自定义千位分隔符或小数分隔符,请使用replace():
123456.78.format(2).replace(',', ' ').replace('.', ' ');
测试套件
function assertEqual(a, b) {
if (a !== b) {
throw a + ' !== ' + b;
}
}
function test(format_function) {
console.log(format_function);
assertEqual('NaN', format_function.call(NaN, 0))
assertEqual('Infinity', format_function.call(Infinity, 0))
assertEqual('-Infinity', format_function.call(-Infinity, 0))
assertEqual('0', format_function.call(0, 0))
assertEqual('0.00', format_function.call(0, 2))
assertEqual('1', format_function.call(1, 0))
assertEqual('-1', format_function.call(-1, 0))
// Decimal padding
assertEqual('1.00', format_function.call(1, 2))
assertEqual('-1.00', format_function.call(-1, 2))
// Decimal rounding
assertEqual('0.12', format_function.call(0.123456, 2))
assertEqual('0.1235', format_function.call(0.123456, 4))
assertEqual('-0.12', format_function.call(-0.123456, 2))
assertEqual('-0.1235', format_function.call(-0.123456, 4))
// Thousands separator
assertEqual('1,234', format_function.call(1234.123456, 0))
assertEqual('12,345', format_function.call(12345.123456, 0))
assertEqual('123,456', format_function.call(123456.123456, 0))
assertEqual('1,234,567', format_function.call(1234567.123456, 0))
assertEqual('12,345,678', format_function.call(12345678.123456, 0))
assertEqual('123,456,789', format_function.call(123456789.123456, 0))
assertEqual('-1,234', format_function.call(-1234.123456, 0))
assertEqual('-12,345', format_function.call(-12345.123456, 0))
assertEqual('-123,456', format_function.call(-123456.123456, 0))
assertEqual('-1,234,567', format_function.call(-1234567.123456, 0))
assertEqual('-12,345,678', format_function.call(-12345678.123456, 0))
assertEqual('-123,456,789', format_function.call(-123456789.123456, 0))
// Thousands separator and decimal
assertEqual('1,234.12', format_function.call(1234.123456, 2))
assertEqual('12,345.12', format_function.call(12345.123456, 2))
assertEqual('123,456.12', format_function.call(123456.123456, 2))
assertEqual('1,234,567.12', format_function.call(1234567.123456, 2))
assertEqual('12,345,678.12', format_function.call(12345678.123456, 2))
assertEqual('123,456,789.12', format_function.call(123456789.123456, 2))
assertEqual('-1,234.12', format_function.call(-1234.123456, 2))
assertEqual('-12,345.12', format_function.call(-12345.123456, 2))
assertEqual('-123,456.12', format_function.call(-123456.123456, 2))
assertEqual('-1,234,567.12', format_function.call(-1234567.123456, 2))
assertEqual('-12,345,678.12', format_function.call(-12345678.123456, 2))
assertEqual('-123,456,789.12', format_function.call(-123456789.123456, 2))
}
console.log('======== Testing ========');
test(Number.prototype.format);
test(Number.prototype.format1);
test(Number.prototype.format2);
test(Number.prototype.format3);
基准
function benchmark(f) {
var start = new Date().getTime();
f();
return new Date().getTime() - start;
}
function benchmark_format(f) {
console.log(f);
time = benchmark(function () {
for (var i = 0; i < 100000; i++) {
f.call(123456789, 0);
f.call(123456789, 2);
}
});
console.log(time.format(0) + 'ms');
}
// If not using async, the browser will stop responding while running.
// This will create a new thread to benchmark
async = [];
function next() {
setTimeout(function () {
f = async.shift();
f && f();
next();
}, 10);
}
console.log('======== Benchmark ========');
async.push(function () { benchmark_format(Number.prototype.format); });
next();
请尝试以下代码
"250000".replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,');
答案:250000
在将PHP number_format()转换为javascript之后,这对我很有用
function number_format(number, decimals = 0, dec_point = ".",thousands_sep = ",") {
number = (number + '').replace(/[^0-9+\-Ee.]/g, '');
var n = !isFinite(+number) ? 0 : +number,
prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),
s = '',
toFixedFix = function(n, prec)
{
var k = Math.pow(10, prec);
return '' + (Math.round(n * k) / k).toFixed(prec);
};
// Fix for IE parseFloat(0.55).toFixed(0) = 0;
s = (prec ? toFixedFix(n, prec) : '' +
Math.round(n)).split('.');
if (s[0].length > 3)
{
s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g,
thousands_sep);
}
if ((s[1] || '').length < prec)
{
s[1] = s[1] || '';
s[1] += new Array(prec - s[1].length + 1).join('0');
}
return s.join(dec_point);
}
这可能有点晚了,但这是我刚刚为同事准备的一个方法,可以为所有数字添加一个支持区域设置的.toCurrencyString()函数。内部化仅用于数字分组,而不是货币符号-如果您输出美元,请使用提供的“$”,因为日本或中国的123 4567美元与美国的1234567美元相同。如果您输出欧元等,请将货币符号从“$”改为“$”。
在HTML<head>部分的任何地方或在需要使用它之前的任何地方声明:
Number.prototype.toCurrencyString = function(prefix, suffix) {
if (typeof prefix === 'undefined') { prefix = '$'; }
if (typeof suffix === 'undefined') { suffix = ''; }
var _localeBug = new RegExp((1).toLocaleString().replace(/^1/, '').replace(/\./, '\\.') + "$");
return prefix + (~~this).toLocaleString().replace(_localeBug, '') + (this % 1).toFixed(2).toLocaleString().replace(/^[+-]?0+/,'') + suffix;
}
那你就完了!在需要将数字输出为货币的任何位置使用(number).toCurrencyString()。
var MyNumber = 123456789.125;
alert(MyNumber.toCurrencyString()); // alerts "$123,456,789.13"
MyNumber = -123.567;
alert(MyNumber.toCurrencyString()); // alerts "$-123.57"
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>