javascript 使用逗号格式化数字字符串
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Format number string using commas
提问by user850234
I want to format numbers. I have seen some of the regex expression example to insert comma in number string. All of them check 3 digits in a row and then insert comma in number. But i want something like this:
我想格式化数字。我看过一些在数字字符串中插入逗号的正则表达式示例。他们都检查一行中的 3 位数字，然后在数字中插入逗号。但我想要这样的东西：
122 as 122
1234 as 1,234
12345 as 12,345
1723456 as 17,23,456
7123456789.56742 as 7,12,34,56,789.56742
I am very new to regex expression. Please help me how to display the number as the above. I have tried the below method. This always checks for 3 digits and then add comma.
我对正则表达式很陌生。请帮助我如何显示上述数字。我试过下面的方法。这总是检查 3 位数字，然后添加逗号。
function numberWithCommas(x) {
return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
But i want comma every 2 digits except for the last 3 digits before the decimals as shown above.
但我想要逗号每 2 位，除了小数点前的最后 3 位，如上所示。
回答by row1
The result will depend on your browsers locale. But this might be an acceptable solution:
结果将取决于您的浏览器区域设置。但这可能是一个可以接受的解决方案：
(7123456789.56742).toLocaleString();
Outputs:
输出：
7,123,456,789.56742
Try it and see if it outputs 7,12,34,56,789.567421in your locale.
尝试一下，看看它是否7,12,34,56,789.567421在您的语言环境中输出。
回答by KooiInc
Here's a function to convert a number to a european (1.000,00 - default) or USA (1,000.00) style:
这是一个将数字转换为欧洲 (1.000,00 - 默认) 或美国 (1,000.00) 样式的函数：
function sep1000(somenum,usa){
var dec = String(somenum).split(/[.,]/)
,sep = usa ? ',' : '.'
,decsep = usa ? '.' : ',';
return dec[0]
.split('')
.reverse()
.reduce(function(prev,now,i){
return i%3 === 0 ? prev+sep+now : prev+now;}
)
.split('')
.reverse()
.join('') +
(dec[1] ? decsep+dec[1] :'')
;
}
Alternative:
选择：
function sep1000(somenum,usa){
var dec = String(somenum).split(/[.,]/)
,sep = usa ? ',' : '.'
,decsep = usa ? '.' : ',';
return xsep(dec[0],sep) + (dec[1] ? decsep+dec[1] :'');
function xsep(num,sep) {
var n = String(num).split('')
,i = -3;
while (n.length + i > 0) {
n.splice(i, 0, sep);
i -= 4;
}
return n.join('');
}
}
//usage for both functions
alert(sep1000(10002343123.034)); //=> 10.002.343.123,034
alert(sep1000(10002343123.034,true)); //=> 10,002,343,123.034
[editbased on comment] If you want to separate by 100, simply change i -= 4;to i -= 3;
[根据评论编辑]如果要以100分隔，只需更改i -= 4;为i -= 3;
function sep100(somenum,usa){
var dec = String(somenum).split(/[.,]/)
,sep = usa ? ',' : '.'
,decsep = usa ? '.' : ',';
return xsep(dec[0],sep) + (dec[1] ? decsep+dec[1] :'');
function xsep(num,sep) {
var n = String(num).split('')
,i = -3;
while (n.length + i > 0) {
n.splice(i, 0, sep);
i -= 3; //<== here
}
return n.join('');
}
}
回答by Mily Dahlke
use toLocaleString(); It automatically handles inserting commas and will also handle uk strings the right way
使用 toLocaleString(); 它会自动处理插入逗号，也会以正确的方式处理 uk 字符串
e.g.
var num=63613612837131;
alert(num.toLocaleString());
例如
var num=63613612837131;
alert(num.toLocaleString());
回答by Malcolm
Below is the snippet of code, can be done in better way but this works :D
以下是代码片段，可以以更好的方式完成，但这有效：D
function formatDollar(num)
{
var p = num.toFixed(2).split(".");
var chars = p[0].split("").reverse();
var sep1000 = false;
var newstr = '';
var count = 0;
var count2=0;
for (x in chars)
{
count++;
if(count%3 == 1 && count != 1 %% !sep1000)
{
newstr = chars[x] + ',' + newstr;
sep1000=true;
}
else
{
if(!sep1000)
{
newstr = chars[x] + ',' + newstr;
}
else
{
count2++;
if(count%2 == 0 && count != 1)
{
newstr = chars[x] + ',' + newstr;
}
else
{
newstr = chars[x] + newstr;
}
}
}
}
return newstr + "." + p[1];
}
