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createXMLHttpRequest();
if(parameter == null){
xmlHttp.onreadystatechange = callback;
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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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