JavaScript 是否考虑本地小数分隔符?

If I was to run this code on a Dutch users machine, should I expect the English-formatted addition to return 0, and the Dutch-formatted addition to return 15,5?

简而言之:JavaScript 计算是否在其字符串到数字的转换中使用本地小数分隔符?

In short: Does the JavaScript calculation use local decimal separators in its string to number conversions?

推荐答案

不，分隔符在 javascript Number 中始终是点 (.).所以 7,75 的计算结果为 75，因为 , 调用从左到右的计算(在控制台中尝试:x=1,x+=1,alert(x) 或更多的点 var x=(7,75); alert(x);).如果你想转换一个荷兰语(嗯，不仅仅是荷兰语，比如说 Continental European)格式的值，它应该是一个 String.您可以为 String 原型编写扩展，例如:

No, the separator is always a dot (.) in a javascript Number. So 7,75 evaluates to 75, because a , invokes left to right evaluation (try it in a console: x=1,x+=1,alert(x), or more to the point var x=(7,75); alert(x);). If you want to convert a Dutch (well, not only Dutch, let's say Continental European) formatted value, it should be a String. You could write an extension to the String prototype, something like:

String.prototype.toFloat = function(){
      return parseFloat(this.replace(/,(d+)$/,'.$1'));
};
//usage
'7,75'.toFloat()+'7,75'.toFloat(); //=> 15.5

注意，如果浏览器支持，你可以使用 Number.toLocaleString

Note, if the browser supports it you can use Number.toLocaleString

console.log((3.32).toLocaleString("nl-NL"));
console.log((3.32).toLocaleString("en-UK"));

.as-console-wrapper { top: 0; max-height: 100% !important; }

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