AJAX请求

客户端HTMLPage.htm页面<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><script src="XmlHttp.js" type="text/javascript"></script>
<head>
    <title></title>
    
    <script type="text/javascript">
        function a() {
            var url = "Handler2.ashx";
            Request.sendGET(url, Success, Failture);
        }        function Success(req) {
            这是从服务器返回的"<script language="javascript" src="test.js"></script>"
            怎么直接让这段js直接运行
             
            "req.responseText"这一段也就是下面的这段应该怎么处理
            req.responseText 
           
        }        function Failture() {
            alert();
        }
    </script>
</head>
<body onload="a();">
    <div id="1">1</div>
    <div>2</div>
    <div>3</div>
    
    
</body>
</html>
服务器端页面Handler2.ashxusing System;
using System.Web;public class Handler2 : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        
        System.Text.StringBuilder sb=new System.Text.StringBuilder();
        sb.AppendLine("<script language=\"javascript\" src=\"test.js\"></script>");
        context.Response.Write(sb.ToString());
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }}