let text = 456890345.678;
let textNew = (text.toString()).replace(/\B(?=(\d{3})+(?!\d))/g, ',');//456,890,345.678

let email = '1516608****@163.com';
let reg = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/;
let result = reg.test(email);//true

let tel = "1516608****";
var reg = /^[1][3,4,5,7,8][0-9]{9}$/;//重点在于[3,4,5,7,8]，现有号段13，15等，根据新的号段随时添加
let result = reg.test(tel);//true