1、原生js写法
1 !function () { 2 document.getElementById('bankCard').onkeyup = function (event) { 3 var v = this.value; 4 if(/S{5}/.test(v)){ 5 this.value = v.replace(/s/g, '').replace(/(.{4})/g, "$1 "); 6 } 7 }; 8 }();
2、jQuery写法
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 </head> 7 <body> 8 <input type="text" id="J_BankCard"/> 9 <script src="http://static.ydcss.com/libs/jquery/1.11.2/jquery.js"></script> 10 <script> 11 !function () { 12 $('#J_BankCard').on('keyup mouseout input',function(){ 13 var $this = $(this), 14 v = $this.val(); 15 /S{5}/.test(v) && $this.val(v.replace(/s/g,'').replace(/(.{4})/g, "$1 ")); 16 }); 17 }(); 18 </script> 19 </body> 20 </html>