手机号隐藏4位
1.mssql中
SELECT INSERT(mobile, 4, 4, '****')AS Mobile from Users ;
2.正则
s.replaceAll("(\d{3})\d{4}(\d{4})", "$1****$2");
3.js
var tel = 18810399133;
tel = "" + tel;
var tel1 = tel.substr(0,3) + "****" + tel.substr(7)
console.log(tel1);