Javascript 与 C# 一样格式化数字

发布于 2024-11-12 05:24:43 字数 622 浏览 2 评论 0原文

我的号码目前为 1,657,108,700，并且还在不断增长。不过我希望它显示为 1,657,108k

javascript 或 html 是否有内置函数可以执行此操作？

该值通过 javascript 设置为 html 中的 span 字段。

[编辑]

从评论中我得到了我的方法：

var start = '1,657,108,700';                
start = (start / 1000).toFixed(0);                                      
var finish = '';
while (start.length > 3)
{       
    finish = ','.concat(start.substring(start.length - 3, 3), finish);      
    start = start.substring(0, start.length - 3);
};
finish = start + finish + "k";
return finish;

但是这返回 1,65,7k 而不是 1,657,108k..有人知道为什么吗？

原文

I have a number which currently is 1,657,108,700 and growing. However I wish for it to show as
1,657,108k

Does javascript or html have a build in function to do this?

The value is being set throu javascript to a span field in html.

[edit]

From the comment I got my method as far as:

var start = '1,657,108,700';                
start = (start / 1000).toFixed(0);                                      
var finish = '';
while (start.length > 3)
{       
    finish = ','.concat(start.substring(start.length - 3, 3), finish);      
    start = start.substring(0, start.length - 3);
};
finish = start + finish + "k";
return finish;

however this returns 1,65,7k instead of 1,657,108k.. anyone know why?

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顾挽 2024-11-19 05:24:43

var formattedNumber = Math.round(yourNumber / 1000).toLocaleString() + "k";

视情况将上面的变成函数或者不变成函数。我不知道有哪个函数可以做到这一点，也不知道有一种方法可以满足非英语版本的“k”（假设有一些），但至少应该采用 toLocaleString()处理千分号问题中的逗号与句号。

更新：我发布了上面的内容，但没有对其进行测试；当我尝试时，我发现 toLocaleString() 将 1234 格式化为 1,234.00。我曾想过通过使用正则表达式替换来删除尾随零来修复它，当然我无法确定 toLocaleString() 将使用哪个字符作为小数点，所以这是行不通的。我想您可以编写一些在“控制”数字（例如 1.1）上使用 toLocaleString() 的代码，以在运行时查看它用于小数的字符。

UPDATE 2 对于您更新的问题，手动插入逗号，我是这样做的：

var unformattedNumber = 123456;
var a = unformattedNumber.toString().split("");
for (var i=a.length-3; i >0; i-=3)
   a.splice(i,0,",");
var formattedNumber = a.join("") + "k";

var formattedNumber = Math.round(yourNumber / 1000).toLocaleString() + "k";

Turn the above into a function or not as appropriate. I'm not aware of a single function to do this, or of a way to cater for non-English versions of "k" (assuming there are some), but at least toLocaleString() should take care of the comma versus fullstop for thousands issue.

UPDATE: I posted the above without testing it; when I tried it out I found toLocaleString() formatted 1234 as 1,234.00. I had thought of fixing it by using a regex replace to remove trailing zeros except of course I can't be sure what character toLocaleString() is going to use for the decimal point, so that won't work. I guess you could write some code that uses toLocaleString() on a "control" number (e.g., 1.1) to see at runtime what character it uses for the decimal.

UPDATE 2 for your updated question, inserting the commas manually, I did it like this:

var unformattedNumber = 123456;
var a = unformattedNumber.toString().split("");
for (var i=a.length-3; i >0; i-=3)
   a.splice(i,0,",");
var formattedNumber = a.join("") + "k";

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