Ajax按需讀取數(shù)據(jù)生成下級(jí)菜單

jilian.htm
代碼如下:
<script language="javascript">
var http_request=false;
function send_request(url){//初始化,指定處理函數(shù)，發(fā)送請(qǐng)求的函數(shù)
http_request=false;
//開(kāi)始初始化XMLHttpRequest對(duì)象
if(window.XMLHttpRequest){//Mozilla瀏覽器
http_request=new XMLHttpRequest();
if(http_request.overrideMimeType){//設(shè)置MIME類(lèi)型
http_request.overrideMimeType("text/html");
}
}
else if(window.ActiveXObject){//IE瀏覽器
try{
http_request=new ActiveXObject("Xsxml2.XMLHTTP");
http_request.setRequestHeader("Content-Type","text/xml");
http_request.setRequestHeader("Content-Type","gb2312");
}
catch(e){
try{
http_request=new ActiveXObject("Microsoft.XMLHTTP");
http_request.setRequestHeader("Content-Type","text/xml");
http_request.setRequestHeader("Content-Type","gb2312");
}
catch(e){
}
}
}
if(!http_request){//異常，創(chuàng)建對(duì)象實(shí)例失敗
window.alert("不能創(chuàng)建XMLHttpRequest對(duì)象實(shí)例");
return false;
}
http_request.onreadystatechange=processRequest;
//確定發(fā)送請(qǐng)求的方式和URL以及是否同步執(zhí)行下段代碼
http_request.open("GET",url,true);
http_request.send(null);
}
//處理返回信息的函數(shù)
function processRequest(){
if(http_request.readyState==4){//判斷對(duì)象狀態(tài)
if(http_request.status==200){//信息已經(jīng)成功返回，開(kāi)始處理信息
document.getElementById(currentPos).innerHTML=http_request.responseText;
}
else{//頁(yè)面不正常
alert("您所請(qǐng)求的頁(yè)面有異常");
}
}
}
function showRoles(obj){
document.getElementById(obj).parentNode.style.display="";
document.getElementById(obj).innerHTML="正在讀取數(shù)據(jù)..."
currentPos=obj;
send_request("jilian_data.asp?playPos="+obj);
}
</script>

<table width="200" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="20">
<a href="javascript:void(0)" onclick="showRoles('pos_1')">經(jīng)理室
</a>
</td>
</tr>
<tr style="display:none">
<td height="20" id="pos_1"> </td>
</tr>
<tr>
<td height="20">
<a href="javascript:void(0)" onclick="showRoles('pos_2')">開(kāi)發(fā)部</a>
</td>
</tr>
<tr style="display:none">
<td id="pos_2" height="20"> </td>
</tr>
</td>
</table>

jilian_data.asp
代碼如下:
<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<%
playPos=request("playPos")
if playPos="pos_1" then
Response.Write("  jingli<br>  副總經(jīng)理")
end if
if playPos="pos_2" then
Response.Write("  總工程師<br>  軟件工程師")
end if
%>

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