格式化银行卡号 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title>格式化数字</title>
 <style type="text/css">
 #cardNumber { height:50px; width:500px; line-height:50px; font-size:48px; }
 </style>
 </head>
 
 <body>
 <input type="text" id="cardNumber" value="" />
 <script type="text/javascript">
 var cardNum = document.getElementById("cardNumber");
 var cardNum_val;
 cardNum.onblur = checkForm;
 function checkForm() {
     cardNum_val = cardNum.value;
     if(cardNum_val === "") {
         return false
     }
     else if(cardNum_val.length === 16) {
         for(var i=0; i<cardNum_val.length; i++) {
             cardNum_val[i] = Number(cardNum_val[i]);
             if(isNaN(cardNum_val[i])) {
                 alert("请输入数字");
                 break;
             }
             else {
                 formatNumber(cardNum_val);
             }
         }
     }
     else {
         return false;
     }
     
     function formatNumber(thisNumber) {
         var newStr = "";
         for(var i=0; i<thisNumber.length; i++) {
             if(i!==0 && i%4===0) {
                 newStr += " ";
             }
             newStr += thisNumber[i];
         }
         cardNum.value = newStr;
     }
 }
 </script>
 </body>
 </html>

 

posted @ 2012-06-13 14:41  00随风00  阅读(201)  评论(0)    收藏  举报