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        var XMLHttpReq=false;
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function createXMLHttpRequest(){
if(window.XMLHttpRequest){ //Mozilla
XMLHttpReq=new XMLHttpRequest();
}
else if(window.ActiveXObject){
try{
XMLHttpReq=new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try{
XMLHttpReq=new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){}
}
}
}
//·¢ËÍÇëÇóº¯Êý
function send(url){
createXMLHttpRequest();
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XMLHttpReq.send(null);  //·¢ËÍÇëÇó
}
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if(XMLHttpReq.readyState==4){ //¶ÔÏó״̬
if(XMLHttpReq.status==200){//ÐÅÏ¢Òѳɹ¦·µ»Ø£¬¿ªÊ¼´¦ÀíÐÅÏ¢
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import javax.servlet.http.HttpServlet;
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