Jquery-同步载入数据

function getItem()

{

var str= $.ajax({ url: "Exec.aspx?flag="+Variables, async: false }).responseText;

var dom=new ActiveXObject("Microsoft.XMLDOM");

dom.loadXML(xml);

var t=dom.getElementsByTagName("item");

var menu=document.getElementById("Sele_City").options;

menu.length=0;

for(var i=0;i<t.length;i++)

{

menu.add(new Option(t[i].getAttribute("name"),t[i].getAttribute("id")));

}

}

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<script runat="server">

void Page_Load(object sender, EventArgs e)

{

Response.ContentType = "text/xml";

Response.Write("<menus>");

Response.Write("<menu name=\"\" id=\"\" </menu>");

DataTable dt =new DataTable();

dt = (数据集);

foreach(DataRow dr in dt.Rows)

{

Response.Write("<menu name=\""+dr["name"].ToString()+"\" id=\""+dr["id"].ToString()+"\" </menu>");

}

Response.Write("</menus>";

}

</script>