老师，console报错

来源：2-2 创建XMLHttpRequest对象

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2019-04-08 21:10:27

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<input id="btnload" type="button" value="加载">
<div id="divContent"></div>
</body>
<script>
document.getElementById("btload").onclick=function(){
   //1.创建XmlHttpRequest对象
   var xmlhttp;
   if(window.XMLHttpRequest){
       xmlhttp=new XMLHttpRequest();
   }else{
       xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
   console.log(xmlhttp);

   //2.发送Ajax请求
   //3.处理服务器响应
}
</script>
</html>

package com.imooc.ajax;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class ContentServlet
*/
@WebServlet("/content")
public class ContentServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public ContentServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

   /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

       response.getWriter().println("<b>I'm sever content</b>");
   }

}