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function sendAsynchronRequest(url,parameter,callback){
 createXMLHttpRequest();
 if(parameter == null){
  xmlHttp.onreadystatechange = callback;
  xmlHttp.open("GET",url,true);//µ±GETÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇ´ø²ÎÊýµÄ£¬¶ø²ÎÊýΪNULL£¬ËùÒÔÓÃgetÇëÇó£¬send(null)
  xmlHttp.send(null);
 }else{
  xmlHttp.onreadystatechange = callback;
  xmlHttp.open("POST",url,true);//get
  xmlHttp.setRequestHeader(
  "Content-Type","application/x-www-form-urlencoded;");
  xmlHttp.send(parameter);//µ±POSTÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇwu²ÎÊýµÄ£¬¶ø²ÎÊý !=NULL£¬ËùÒÔÓÃÉèÖÃΪPOSTÇëÇó£¬send(parameter)
 }
}


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