var a = 2221222122.675414
? var b = a.toFixed(a.toString().split(".")[1].length).replace(/(\d)(?=(\d{3})+\.)/g, '$1,');//使用正則替換义郑,每隔三個數(shù)加一個','
?? console.log(b)?????? //2,221,222,122.675414
var a = 2221222122.675414
? var b = a.toFixed(a.toString().split(".")[1].length).replace(/(\d)(?=(\d{3})+\.)/g, '$1,');//使用正則替換义郑,每隔三個數(shù)加一個','
?? console.log(b)?????? //2,221,222,122.675414