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C#

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
<script>
function IsNum(intNum)
{
 var re = /[^0-9.]/;
 var IsNum = false;
 if(intNum.match(re)==null)
  IsNum = true;
  
 return IsNum;
}
var bolAlert = true;
function EnterNum(objField)
{
 
 if(!IsNum(objField.value))
 { 
  objField.value ="";
  alert("please enter a number");
  
 }
}
</script>

 </HEAD>

 <BODY>
 onpropertychange
  <input type"text"  onpropertychange="javascript:EnterNum(this);" id="dd" />
 </BODY>
</HTML>

posted on 2008-05-19 15:52  javaca88  阅读(134)  评论(0)    收藏  举报