js写法
data.userPhone = data.userPhone.replace(/(\d{3})\d{4}(\d{4})/g,‘2’)
data.userIdCard = data.userIdCard.replace(/(\d{4})\d{10}(\d{4})/g,‘2’)
java写法
System.out.println(userPhone.replaceAll("(\d{3})\d{4}(\d{4})","2"));
System.out.println(userIdCard.replaceAll("(\d{4})\d{10}(\d{4})","2"));