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    function getMessage(){
try {
    if(window.XMLHttpRequest){
    ajax=new XMLHttpRequest();   
    }else if(window.ActiveXObject){
    ajax=new ActiveXObject("Microsoft.XMLHTTP");
    }
¡¡ } catch (e) {
¡¡¡¡ ajax = false;
¡¡ }
¡¡var url = "./servlet/MessageServlet?method=getmessage";
  ajax.open("GET",url,true);
¡¡ajax.onreadystatechange = aa;
  ajax.send(null);
}

        function aa() {
        ¡¡¡¡if (ajax.readyState == 4 && ajax.status == 200) {
  alert(ajax.responseText);
  document.getElementById("message").innerHTML= ajax.responseText;
}
    }
   
jsp´úÂë:
<div id="message" > </div>
<input type="button" value="ȡֵ" onclick="getMessage()">

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