function formatToCurrency(amount){
return (amount).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
formatToCurrency(12.34546); //"12.35"
formatToCurrency(42345255.356); //"42,345,255.36"// Create our number formatter.
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
// These options are needed to round to whole numbers if that's what you want.
//minimumFractionDigits: 0, // (this suffices for whole numbers, but will print 2500.10 as $2,500.1)
//maximumFractionDigits: 0, // (causes 2500.99 to be printed as $2,501)
});
formatter.format(2500); /* $2,500.00 */