anchor.diff:  <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
  +<%@ taglib  prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
   <%
   String path = request.getContextPath();
   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  
positive.code: 
                  </div>
              </div>
          </div>
  
          <div class="introduction1">
              <div class="introduction1_content">
  
  
negative.code:                         </div>
                      </div>
                      <div id="id_login_input" class="login_input">
                          
                           <c:choose>
                              <c:when test="${sessionScope.loginStatu == null || sessionScope.username == null || sessionScope.userid == null || sessionScope.images == null}">
                                  <div class="login_input_box">
                                      <form class="form-signin">
                                          <div class="login-item">
                                              <input type="text" name="username" placeholder="账号" id="login-username" class="item-content" />
                                          </div>
                                          <div class="login-item">
                                              <input type="password" name="password" placeholder="密码" id="login-password" class="item-content" /> 
                                          </div>
                                          <div class="login-item">
                                              <input type="text" name="vcode" placeholder="验证码" class="item-content" id="login-checkImg" />
                                              <img src="" alt="验证码" name="checkImg" id="show-checkImg" />
                                          </div>
                                          <button class="btn form-submit" type="submit" name="login">登录</button>
                                          <a href="javascript:void(0);" id="forget_pw">忘记密码?</a>
                                      </form>
                                  </div>
                              </c:when>
                              <c:otherwise>
                                  <a href="<%=basePath + "project/showProject.action" %>" class="btn btn-project" style="border-radius: 10px;margin: 100px;">我的项目</a>
                              </c:otherwise>
                          </c:choose>
                      </div>
                      <div id="id_register_input" class="register_input c_input">
                          <div class="register_input_box">
                              <a href="<%=basePath + "jsp/login/register.jsp" %>"><button class="btn" type="submit">马上注册</button></a>
                              <!--跳转到注册页面-->
                          </div>
  