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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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<input type="button" onclick="test();" value="Ìá½»"/>
<script type="text/javascript">
function test(){
var valid = {
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