兼容firefox的文本框只能输入两位小数的数字的代码

<html> <body> <script> function checkNumber(e,txt) { var key = window.event ? e.keyCode : e.which; var keychar = String.fromCharCode(key); var el = document.getElementById('test'); var msg = document.getElementById('msg'); reg = /\d|\./; var result = reg.test(keychar); if(result) { if(e.keyCode==46) result=!(txt.value.split('.').length>1); else result=!(txt.value.split('.').length>1&&txt.value.split('.')[1].length>1); } if(!result) { el.className = "warn"; msg.innerHTML = "只能输入数字"; return false; } else { el.className = ""; msg.innerHTML = ""; return true; } } </script> 只能输入数字的文本框<input type="text" name="question.page" onkeypress="return checkNumber(event,this);"> <span id="msg"></span> </body> </html>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]