如何在 JavaScript 中使用 toLocaleString() 和 tofixed(2)
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How to use toLocaleString() and tofixed(2) in JavaScript
提问by Question User
How can I do this in JavaScript?
我怎样才能在 JavaScript 中做到这一点？
var num = 2046430;
num.toLocaleString();
will give you "2,046,430";
What I have tried is:
我尝试过的是：
var num = 2046430;
num.toLocaleString().toFixed(2);
Expected Output
预期产出
"2,046,430.00"
“2,046,430.00”
回答by Sebastian Nette
Taken from MDN:
摘自 MDN：
Syntax
句法
numObj.toLocaleString([locales [, options]])
numObj.toLocaleString([locales [, options]])
toLocaleStringtakes 2 arguments. The first is the locale, the second are the options. As for the options, you are looking for:
toLocaleString需要 2 个参数。第一个是语言环境，第二个是选项。至于选项，您正在寻找：
minimumFractionDigits
The minimum number of fraction digits to use. Possible values are from 0 to 20; the default for plain number and percent formatting is 0; the default for currency formatting is the number of minor unit digits provided by the ISO 4217 currency code list (2 if the list doesn't provide that information).
最小分数
要使用的最小小数位数。可能的值是从 0 到 20；普通数字和百分比格式的默认值为 0；货币格式的默认值是 ISO 4217 货币代码列表提供的次要单位位数（如果列表不提供该信息，则为 2）。
https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
To be able to set the options without setting the locale, you can pass undefined as first argument:
为了能够在不设置语言环境的情况下设置选项，您可以将 undefined 作为第一个参数传递：
var num = 2046430;
num.toLocaleString(undefined, {minimumFractionDigits: 2}) // 2,046,430.00
However this also allows the fraction to be longer than 2 digits. So we need to look for one more option called maximumFractionDigits. (Also on that MDN page)
然而，这也允许分数长于 2 位数。所以我们需要寻找一个名为maximumFractionDigits. （也在那个 MDN 页面上）
var num = 2046430.123;
num.toLocaleString(undefined, {
minimumFractionDigits: 2,
maximumFractionDigits: 2
}) // 2,046,430.12
