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   var bCheckUserPass = false;
   var StrType;
   function checkUsers(StrTmp)
   {
    var oB = window.document.all.nam
    StrType=StrTmp
    if (oB.length == 0) return;
    /// ²»ÔÊÐíÍæ¼ÒÃûÖÐÓÐÓ¢ÎĶººÅ
    for (var i=0; i<oB.length; i++)
    {
     if (oB.value.length > 0)
     {
      if (!checkUserNameHasComma(oB.value))
      {
       alert("´íÎó£ºÍæ¼ÒÃû×ÖÀïÃæ²»ÄÜÓÐÓ¢ÎĶººÅ(°ë½Ç¶ººÅ)£¡¡¡¡¡¡¡\nÍæ¼Ò£º"+oB.value);
       return;
      }
     }
    }
    var sNames = "";
    for (var i=0; i<oB.length; i++)
    {
     if (oB.value.length > 0)
     {
      sNames += oB.value;
      sNames += ",";
     }
    }
    if (sNames.length > 0)
    {
     sUserNames = sNames.substr(0, sNames.length-1);
     getXml("checkuser");//window.setTimeout("getXml('checkuser')", 100);
    }
   }
   /// ²»ÔÊÐíÍæ¼ÒÃûÖÐÓÐÓ¢ÎĶººÅ
   function checkUserNameHasComma(sName)
   {
    if (sName == ""||sName == null) return false;
    var oRex = /,/g;
    if (sName.search(oRex) != -1) return false;
    return true;
   }
 //-----


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var xmlHttp;
var flag = false;
function createXMLHttpRequest()
{
  if(window.ActiveXObject)
  {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  else if(window.XMLHttpRequest)
  {
  xmlHttp=new XMLHttpRequest();
  }
}
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>JavaScript Sample</title>
<link rel="stylesheet" type="text/css" href="main.css" media="all">
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     <input type="text" name="username">&nbsp;&nbsp;<input type="button" value="¼ì²é" onclick="return check();">
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var xmlHttp;
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