1、实现输入框实时输入卡号，每4位自动添加"-"符号进行分割，效果图如下：
2、Java代码实现：
public static void main(String[] args) {
String l = "12222";
int num;
if (l.length() % 4 == 0) {
num = l.length() / 4 ;
} else {
num = l.length() / 4 +1;
}
String s = "";
for (int i = 0; i < num; i++) {
if(l.length() % 4 == 0) {
s += l.substring(4*i, (4 * (i + 1)));
s+= "-";
}else {
if(i!=num-1){
s += l.substring(4*i, (4 * (i + 1)));
s+= "-";
}
if(i==num-1 ){
s += l.substring(4*(i));
s+= "-";
}
}
}
if (s.substring(s.length()-1).equals("-")) {
s = s.substring(0, s.length()-1);
}
System.out.println(s);
}
3、JS方法实现：
//卡号处理方式-输入框input()方法
function ChangeMethod(aObject){
var yAuthorAccNo = aObject.value;
if(yAuthorAccNo==null || yAuthorAccNo==""){
var yAuthorAccNo = aObject;
}
if(yAuthorAccNo!="" && yAuthorAccNo.indexOf("-")>-1 ){
var AuthorAccNo = yAuthorAccNo.replace(new RegExp("-","gm"),"");
}else {
var AuthorAccNo = yAuthorAccNo;
}
var num;
if (AuthorAccNo.length % 4 == 0) {
num = parseInt(AuthorAccNo.length / 4) ;
} else {
num = parseInt(AuthorAccNo.length / 4) +1;
}
var sAuthorAccNo = "";
for (var i = 0; i < num; i++) {
if(AuthorAccNo.length % 4 == 0) {
sAuthorAccNo += AuthorAccNo.substring(4*i, (4 * (i + 1)));
sAuthorAccNo+= "-";
}else {
if(i!=num-1){
sAuthorAccNo += AuthorAccNo.substring(4*i, (4 * (i + 1)));
sAuthorAccNo+= "-";
}
if(i==num-1 ){
sAuthorAccNo += AuthorAccNo.substring(4*(i));
sAuthorAccNo+= "-";
}
}
}
if (sAuthorAccNo.substring(sAuthorAccNo.length-1)=="-") {
sAuthorAccNo = sAuthorAccNo.substring(0, sAuthorAccNo.length-1);
}
fm.AuthorAccNo.value=sAuthorAccNo;
}
