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xmlhttp.js
function $() {
  var elements = new Array();
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);
    if (arguments.length == 1)
      return element;
    elements.push(element);
  }
  return elements;
}
//------------------------------------------------------------------------------------------
//·â×°XMLHTTPµÄRequestÀàµÄ´úÂë
var Request = new Object();
//¶¨ÒåÒ»¸öXMLHTTPµÄÊý×é
Request.reqList = [];
//´´½¨Ò»¸öXMLHTTP¶ÔÏ󣬼æÈݲ»Í¬µÄä¯ÀÀÆ÷
function getAjax()
{
    var ajax=false;
    try
    {
     ajax = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e)
     {
      try
      {
      ajax = new ActiveXObject("Microsoft.XMLHTTP");
      }
     catch (E)
      {
      ajax = false;
      }
    }
    if (!ajax && typeof XMLHttpRequest!='undefined')
    {
     ajax = new XMLHttpRequest();
    }
    return ajax;
}
//·â×°XMLHTTPÏò·þÎñÆ÷·¢ËÍÇëÇóµÄ²Ù×÷
//url:Ïò·þÎñÆ÷ÇëÇóµÄ·¾¶£»method£ºÇëÇóµÄ·½·¨£¬¼´ÊÇGET»¹ÊÇPOST£»callback£ºµ±·þÎñÆ÷³É¹¦·µ»Ø½á¹ûʱ£¬µ÷Óõĺ¯Êý
//data£ºÏò·þÎñÆ÷ÇëÇóʱ¸½´øµÄÊý¾Ý£»urlencoded£ºurlÊÇ·ñ±àÂ룻callback2;µ±·þÎñÆ÷·µ»Ø´íÎóʱµ÷Óõĺ¯Êý
Request.send = function(url, method, callback, data, urlencoded, callback2)
 {
    var req=getAjax();  //


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jquery php ajax json

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<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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