Firefox-compatible text boxes can only enter codes with two decimal places_Form special effects

<div id="test"> <input type="text" name="question.page" onkeypress="return checkNumber(event,this);"> Text box that can only enter numbers <span id="msg"> </span> </div>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<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>