anchor.diff:                              <label class="control-label col-md-2">图*</label>
                               <div class="col-md-10" id="uploadContainer">
                                   <p class="help-block">请上传4:3的jpg，png，宽度400px-800px</p>
  -                                <a href="#" class="btn btn-success" id="uploadBtn1">
  +                                <a href="#" id="uploadBtn1">
                                       <c:if test="${empty hp.imageUrl1}">
                                       <img  id="image1"  style="width:100px"
                                       src="resources/images/app/defaultThumb.png"/>
  
positive.code:                                     <input type="hidden" id="imageUrl2" value="${hp.imageUrl2}" name="imageUrl2">
                                      </c:if>
                                  </a>
                                  <a href="#" class="btn btn-success" id="uploadBtn3">
                                      <c:if test="${empty hp.imageUrl3}">
                                      <img  id="image3"  style="width:100px"
                                      src="resources/images/app/defaultThumb.png"/>
  
negative.code:                                     <input type="hidden" id="imageUrl1" value="${hp.imageUrl1}" name="imageUrl1">
                                      </c:if>
                                  </a>
                                  <a href="#" id="uploadBtn2">
                                      <c:if test="${empty hp.imageUrl2}">
                                      <img  id="image2"  style="width:100px"
                                      src="resources/images/app/defaultThumb.png"/>
  