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Java code:

//¸Ä±äÏÔʾÉϴεç·ÑÐÅÏ¢
/*ajax */
var xmlHttp;
function createXMLHttpRequest() {
//±íʾµ±Ç°ä¯ÀÀÆ÷²»ÊÇie,Èçns,firefox
if(window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
} else if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}


function change_pre_df(obj){
var site_name = obj.value;
if (site_name != "") {
//½¨Á¢AjaxºËÐĶÔÏó
createXMLHttpRequest();
var url = "xml_pre_elec.jsp?county_id="+theForm.county_id.value+"&site_name="+site_name;
//ºÍÒýÇæ½¨Á¢Á¬½Ó
xmlHttp.open("POST", url, true);
//»Øµ÷·½·¨µØÖ·
xmlHttp.onreadystatechange=callback;
//½«²ÎÊý·¢µ½ÒýÇæ
xmlHttp.send(null);
}else {
document.getElementById("pre_df_message").innerHTML = "";
}
}
function callback() {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
var r


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