js为数字添加逗号并格式化数字的代码

function addCommas(nStr) 
{ 
nStr += ''; 
x = nStr.split('.'); 
x1 = x[0]; 
x2 = x.length > 1 ? '.' + x[1] : ''; 
var rgx = /(\d+)(\d{3})/; 
while (rgx.test(x1)) { 
x1 = x1.replace(rgx, '$1' + ',' + '$2'); 
} 
return x1 + x2; 
} //数字格式化就可以变成 
var num = 123456.4231; 
num = num.toFixed(2); 
num =addCommas(num); 
// num = 123456.42