如何格式化数字？ [复制]

我想使用 JavaScript 格式化数字。

例如：

10     => 10.00
100    => 100.00
1000   => 1,000.00
10000  => 10,000.00
100000 => 100,000.00

如果你想使用内置代码，你可以使用toLocaleString() https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString with minimumFractionDigits.

浏览器兼容性 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString#Browser_compatibility对于扩展选项toLocaleString()我第一次写这个答案时受到限制，但目前的状态看起来不错。如果您使用的是 Node.js https://stackoverflow.com/a/23200062/241211，你需要npm install the intl https://www.npmjs.com/package/intl包裹。

var value = (100000).toLocaleString(
  undefined, // leave undefined to use the visitor's browser 
             // locale or a string like 'en-US' to override it.
  { minimumFractionDigits: 2 }
);
console.log(value);

Number formatting varies between cultures. Unless you're doing string comparison on the output,¹ the polite thing to do is pick undefined and let the visitor's browser use the formatting they're most familiar with.²

// Demonstrate selected international locales
var locales = [
  undefined,  // Your own browser
  'en-US',    // United States
  'de-DE',    // Germany
  'ru-RU',    // Russia
  'hi-IN',    // India
  'de-CH',    // Switzerland
];
var n = 100000;
var opts = { minimumFractionDigits: 2 };
for (var i = 0; i < locales.length; i++) {
  console.log(locales[i], n.toLocaleString(locales[i], opts));
}

如果您来自与上述格式不同的文化，请edit https://stackoverflow.com/posts/30106316/edit这篇文章并添加您的区域设置代码。

_{¹ Which you shouldn't.
² Obviously do not use this for currency https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString#using_options with something like {style: 'currency', currency: 'JPY'} unless you have converted to the local exchange rate. You don't want your website to tell people the price is ¥300 when it's really $300. Sometimes real e-commerce sites make this mistake.}