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var xMLHttpRequest=false;
function createXMLHttpRequest(){
   if(window.XMLRequest){  // Mozillaä¯ÀÀÆ÷
      xMLHttpRequest = new XMLHttpRequest();
   }else if(window.ActiveObject){
      try{
         XMLHttpRequest = new ActiveXobject(“Msxml2.XMLHTTP”);
      }catch(e){
         try{
            XMLHttpRequest = new ActiveXobject(“Microsoft.XMLHTTP”);
         }catch(e){}
      }
   }
}
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function sendRequest(url){
   createXMLHttpRequest();
   XMLHttpRequest.open(“GET”,url,true);
   XMLHttpRequest.onreadystatechange=processResponse; //Ö¸¶¨ÏìÓ¦º¯Êý
   XMLHttpRequest.send(null); //·¢ËÍÇëÇó
}
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function processResponse(){
   if(XMLHttpRequest.readystate==4){ // Åж϶ÔÏó״̬
      if(XMLHttpRequest.status==200){  // ÐÅÏ¢ÒѾ­·µ»Ø£¬¿ªÊ¼´¦ÀíÐÅÏ¢
         var res =
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package com.yz.mystack;
public class Stack {
Object[] datas;
Integer n=0;
Integer N=1;
public Stack(){
datas=new Object[N];
}

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import javax.swing.*;
import java.awt.*;
public class ToCenter
{
  public ToCenter(JFrame frame)
   {
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