var data = "3265986532146598";
console.log(data.replace(/\s/g,'').replace(/(\d{4})\d+(\d{4})$/, "**** **** **** $2"))
//最后输出为：**** **** **** 6598
下面的正则，显示前4位和后4位，中间的全部用星号显示（1234 **** **** 1234）：
var data = "3265986532146598";
console.log(data.replace(/\s/g,'').replace(/(\d{4})\d+(\d{4})$/, "$1 **** **** $2"))
//最后输出为：3265 **** **** 6598