想实现选取下拉框后，后台实时查询相关数据，并返回前端显示
前端index.ejs
<!DOCTYPE html>
<html>
<head>
<meta charset=“UTF-8” />
<title><%= title %></title>
<link rel=‘stylesheet’ href=’/stylesheets/style.css’ />
<script src="/javascripts/jquery-2.1.1.min.js"></script>
<script type=“text/javascript”>
function showCustomer(str) {
var xmlhttp;
if (str=="") {
document.getElementById(“txtHint”).innerHTML="";
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else
{// code for IE6, IE5
xmlhttp = new ActiveXObject(“Microsoft.XMLHTTP”);
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState ==4 && xmlhttp.status == 200) {
document.getElementById(“txtHint”).innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open(“GET”,"/public/javascripts/func.js?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<p><%= title %></p>
<form action="" style=“margin-top:15px;”>
<label>请选择一个群组：
<select name=“groupname” onchange=“showCustomer(this.value)” style=“font-family:Verdana, Arial, Helvetica, sans-serif;”>
<option value=“baidu”>BAIDU</option>
<option value=“tencent”>TENCENT</option>
<option value=“ali”>ALI</option>
</select>
</label>
</form>
<div id=“txtHint”>群组信息将在此处列出 …</div>
</body>
<script type=“text/javascript” src="/javascripts/func.js"></script>
</html>
查询功能/public/javascripts/func.js var mongoose = require(‘mongoose’) ; var models = require(’./models.js’) ; var GroupModel = models.Group ; mongoose.connect(‘mongodb://localhost/mytest’) ; var getinfo = function(req,res){ var name = req.query.q; GroupModel.find({groupname:name},function(err,doc){ if(doc != 0){ console.log(‘ooooooo’);//用于测试该函数是否被调用 res.write(doc[0].descriptions); } }); }; getinfo();
控制台输出 Express server listening on port 3000 GET / 304 21ms GET /stylesheets/style.css 304 8ms GET /javascripts/jquery-2.1.1.min.js 304 8ms GET /javascripts/func.js 200 12ms - 1006b GET /public/javascripts/func.js?q=baidu 404 2ms 还是没有反应了，也就是func.js并未被调用 请问：node怎么和ajax结合？
