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    <select id="sel1" onchange="return choose(this);">
        <option value="">--ÇëÑ¡Ôñ--</option>
        <option value="1">ºþÄÏÊ¡</option>
        <option value="2">ºþ±±Ê¡</option>
    </select>
    &nbsp;&nbsp;
    ÇëÑ¡ÔñÊУº
    <select id="sel2">
        <option value="">--ÇëÑ¡Ôñ--</option>
    </select>
 
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    var xmlHttp;
    //´´½¨XMLHttpRequest¶ÔÏó
    function createXMLHttpRequest() {
       if(window.ActiveXObject) {
           xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
       } else if (window.XMLHttpRequest) {
           xmlHttp = new XMLHttpReuqest();
       }
    }
    //Ñ¡ÔñÏÂÁÐÁбíÖеÄÖµ
    function choose(obj) {
       var province = obj.value;
       createXMLHttpRequest();
       xmlHttp.onreadystatechange = process;
       xmlHttp.open("GET", "SelProvince?province=" + province);
       xmlHttp.send(null);
    }
   
    //ÓÃÀ´´¦Àí״̬¸Ä±äµÄº¯Êý
    function process() {
       //¶¨ÒåÒ»¸ö±äÁ¿ÓÃÓÚ´æ·Å´Ó·þÎñÆ÷·µ»ØµÄÏìÓ¦½á¹û
       var result;
       if(xmlHttp.readyState == 4) { //Èç¹ûÏìÓ¦Íê³É
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var jsonObj;
var xmlhttp = null;
function callAsync(url, callbackSuccess)
{
 xmlhttp = new Ajax();
 xmlhttp.open("GET", url, true);
 xmlhttp.onreadystatechange=function()
 {
  // readyState = 4 ; "complete"
  if (xmlhttp.readyState==4)
  { ......

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Ajax Loading½ø¶ÈÌõgifÔÚÏßÉú³ÉÍøÕ¾Preloaders.net


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     <input type="text" name="username">&nbsp;&nbsp;<input type="button" value="¼ì²é" onclick="return check();">
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var xmlHttp;
    //´´½¨XMLHttpRequest ......
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