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：publicstaticvoidmain(String[]args){Stringl="12222";intnum;if(l.length()%4==0){num=l.length()/4;}else{num=l.length()/4+1;}Strings="";for(inti=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;}