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function saveObj(){
    var userName = document.getElementById("userName").value;  
    checkUserName(userName);
}
//ʹÓÃajaxʵÏÖÒ³ÃæÎÞˢй¦ÄÜ; 
    var xmlHttpRequest;
    function createXMLHttpRequest(){
      if(window.XMLHttpRequest){
      xmlHttpRequest = new XMLHttpRequest();
      }else if(window.ActiveXObject){
      try{
        xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(e){
        try{
          xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
        }catch(e1){}
        }
      }
    }
    
    
    //ʵÏÖÓû§ÃûУÑé¼¼Êõ;
    function checkUserName(userName){
      createXMLHttpRequest();      
        var url="/sxyj/jsp/SystemUserVOAction.do?userName='"+userName+"'";    
      xmlHttpRequest.open("post",url);
      xmlHttpRequest.onreadystatechange = checkUser;      
      xmlHttpRequest.send(null);    
    }
    
  function checkUser(){
      if(xmlHttpRequest.readyState==4){
      if(xmlHttpRequest.status==200){
      var user="fail";
        var mess = xmlHttpRequest.responseText;
        if(mess=="success"){
            alert("´ËÓû§ÒÑ´æÔÚ");
            document.getElementById("txt_Name").focus();  
            return;
        }else{
            document.f


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