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HTML code:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<script type="text/javascript">
var httpRequest;
function ttt(){
httpRequest.onreadystatechange = function(){
if(httpRequest.readyState == 4){
var rv = httpRequest.responseText;
//Ϊʲô´òÓ¡³öÀ´ÊÇfalse°¡?
alert("Öµ:"+rv+"\nÀàÐÍ:"+typeof(rv)+"\nresponseText == 'Hello':"+(rv == "Hello"));
if(rv == "Hello"){//Ϊʲô½ø²»À´?
alert("in");
}
}
}
httpRequest.open("GET","do.jsp",true);
httpRequest.send(null);
}

function createHttpRequest(){
try {
httpRequest = new XMLHttpRequest();
httpRequest.overrideMimeType('text/xml');
} catch (e) {
try {
//IE 6.0+
httpRequest = new ActiveXObject("msxml2.XMLHTTP");
} catch (e) {
try {
httpRequest = new ActiveXObject("Mircrosoft.XMLHTTP");
} catch (e) {
alert("ÄúµÄä¯ÀÀÆ÷²»Ö§³Ö


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