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
String.prototype.toPrice = function () {
var v;
if (/^\d+(,\d+)$/.test(this))
v = this.replace(/,/, '.');
else if (/^\d+((,\d{3})*(\.\d+)?)?$/.test(this))
v = this.replace(/,/g, "");
else if (/^\d+((.\d{3})*(,\d+)?)?$/.test(this))
v = this.replace(/\./g, "").replace(/,/, ".");
var x = parseFloat(v).toFixed(2).toString().split("."),
x1 = x[0],
x2 = ((x.length == 2) ? "." + x[1] : ".00"),
exp = /^([0-9]+)(\d{3})/;
while (exp.test(x1))
x1 = x1.replace(exp, "$1" + "," + "$2");
return x1 + x2;
}
alert("123123".toPrice()); //123,123.00
alert("123123,316".toPrice()); //123,123.32
alert("12,312,313.33213".toPrice()); //12,312,313.33
alert("123.312.321,32132".toPrice()); //123,312,321.32
其他回答
这可能奏效:
function format_currency(v, number_of_decimals, decimal_separator, currency_sign){
return (isNaN(v)? v : currency_sign + parseInt(v||0).toLocaleString() + decimal_separator + (v*1).toFixed(number_of_decimals).slice(-number_of_decimals));
}
没有循环,没有正则表达式,没有数组,没有奇异条件。
处理货币输出(包括负数)的函数。样本输出:$5.23-$5.23
function formatCurrency(total) {
var neg = false;
if(total < 0) {
neg = true;
total = Math.abs(total);
}
return (neg ? "-$" : '$') + parseFloat(total, 10).toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, "$1,").toString();
}
我们也可以使用numeraljs
数字的格式可以像货币、百分比、时间,甚至是带有小数位数、千位和缩写的普通数字。您可以始终创建自定义格式。
var string = numeral(1000).format('0,0');
// '1,000'
下面是Patrick Desjardins(别名Daok)代码,添加了一些注释和一些小改动:
/*
decimal_sep: character used as decimal separator, it defaults to '.' when omitted
thousands_sep: char used as thousands separator, it defaults to ',' when omitted
*/
Number.prototype.toMoney = function(decimals, decimal_sep, thousands_sep)
{
var n = this,
c = isNaN(decimals) ? 2 : Math.abs(decimals), // If decimal is zero we must take it. It means the user does not want to show any decimal
d = decimal_sep || '.', // If no decimal separator is passed, we use the dot as default decimal separator (we MUST use a decimal separator)
/*
According to [https://stackoverflow.com/questions/411352/how-best-to-determine-if-an-argument-is-not-sent-to-the-javascript-function]
the fastest way to check for not defined parameter is to use typeof value === 'undefined'
rather than doing value === undefined.
*/
t = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep, // If you don't want to use a thousands separator you can pass empty string as thousands_sep value
sign = (n < 0) ? '-' : '',
// Extracting the absolute value of the integer part of the number and converting to string
i = parseInt(n = Math.abs(n).toFixed(c)) + '',
j = ((j = i.length) > 3) ? j % 3 : 0;
return sign + (j ? i.substr(0, j) + t : '') + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : '');
}
这里有一些测试:
// Some tests (do not forget parenthesis when using negative numbers and number with no decimals)
alert(123456789.67392.toMoney() + '\n' + 123456789.67392.toMoney(3) + '\n' + 123456789.67392.toMoney(0) + '\n' + (123456).toMoney() + '\n' + (123456).toMoney(0) + '\n' + 89.67392.toMoney() + '\n' + (89).toMoney());
// Some tests (do not forget parenthesis when using negative numbers and number with no decimals)
alert((-123456789.67392).toMoney() + '\n' + (-123456789.67392).toMoney(-3));
次要变化包括:
移动了一点Math.abs(小数),只有当不是NaN时才能执行。decimal_sep不能再是空字符串(必须使用某种十进制分隔符)我们使用typeof thousand_sep===“undefined”,如How best to determine if a argument is not send to JavaScript function中所建议的不需要(+n||0),因为这是Number对象
JSFiddle公司
快速快捷的解决方案(适用于任何地方!)
(12345.67).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'); // 12,345.67
此解决方案背后的思想是用第一个匹配和逗号替换匹配的部分,即“$&,”。匹配是使用前瞻方法完成的。您可以将表达式读为“匹配一个数字,如果它后面跟着三个数字集(一个或多个)和一个点的序列”。
测验:
1 --> "1.00"
12 --> "12.00"
123 --> "123.00"
1234 --> "1,234.00"
12345 --> "12,345.00"
123456 --> "123,456.00"
1234567 --> "1,234,567.00"
12345.67 --> "12,345.67"
演示:http://jsfiddle.net/hAfMM/9571/
扩展短解决方案
您还可以扩展Number对象的原型,以添加对任意数量的小数[0..n]和数字组大小[0..x]的额外支持:
/**
* Number.prototype.format(n, x)
*
* @param integer n: length of decimal
* @param integer x: length of sections
*/
Number.prototype.format = function(n, x) {
var re = '\\d(?=(\\d{' + (x || 3) + '})+' + (n > 0 ? '\\.' : '$') + ')';
return this.toFixed(Math.max(0, ~~n)).replace(new RegExp(re, 'g'), '$&,');
};
1234..format(); // "1,234"
12345..format(2); // "12,345.00"
123456.7.format(3, 2); // "12,34,56.700"
123456.789.format(2, 4); // "12,3456.79"
演示/测试:http://jsfiddle.net/hAfMM/435/
超扩展短解决方案
在此超级扩展版本中,您可以设置不同的分隔符类型:
/**
* Number.prototype.format(n, x, s, c)
*
* @param integer n: length of decimal
* @param integer x: length of whole part
* @param mixed s: sections delimiter
* @param mixed c: decimal delimiter
*/
Number.prototype.format = function(n, x, s, c) {
var re = '\\d(?=(\\d{' + (x || 3) + '})+' + (n > 0 ? '\\D' : '$') + ')',
num = this.toFixed(Math.max(0, ~~n));
return (c ? num.replace('.', c) : num).replace(new RegExp(re, 'g'), '$&' + (s || ','));
};
12345678.9.format(2, 3, '.', ','); // "12.345.678,90"
123456.789.format(4, 4, ' ', ':'); // "12 3456:7890"
12345678.9.format(0, 3, '-'); // "12-345-679"
演示/测试:http://jsfiddle.net/hAfMM/612/