anchor.diff:                          </div>
                       </div>
                       <div id="id_login_input" class="login_input">
  -                        <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" />
  +                        
  +                         <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>
  -                                <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">
  -                            <!--<form class="form-signin" method="post">-->
  -                                <!--&lt;!&ndash;<input type="text" class="input-block-level" name="username" placeholder="用户名（可填英文昵称或邮箱）">&ndash;&gt;-->
  -                                <!--&lt;!&ndash;<input type="password" class="input-block-level" name="password"  placeholder="密码">&ndash;&gt;-->
  -                                <!--&lt;!&ndash;<input type="password" class="input-block-level" name="confirm_password"  placeholder="再次输入密码">&ndash;&gt;-->
  -                                <!--&lt;!&ndash;<input type="text" class="input-block-level" name="v_code"  placeholder="验证码">&ndash;&gt;-->
  -                                <!--&lt;!&ndash;<div class="control-group">&ndash;&gt;-->
  -                                    <!--&lt;!&ndash;<div class="controls">&ndash;&gt;-->
  -                                        <!--&lt;!&ndash;<img src="#" id="v_code_img">&ndash;&gt;-->
  -                                    <!--&lt;!&ndash;</div>&ndash;&gt;-->
  -                                <!--&lt;!&ndash;</div>&ndash;&gt;-->
  -                            <!--</form>-->
                               <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>
  
positive.code: <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
  <%
  String path = request.getContextPath();
  String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  
negative.code: 
                  </div>
              </div>
              
          </div>
          
          <div class="introduction1">
              <div class="introduction1_content">
  
  