海园帮忙写的JQUERY功能，实现了我们想要的，我觉得有点屌哟~~

<form action="{{ url_for(‘update_svn_java‘) }}" method=post class="am-form am-form-horizontal" id = "update_svn_java">
   
          <div class="am-form-group">
            <div class="am-u-sm-9 am-u-sm-push-3">
          <button type="submit" class="am-btn am-btn-primary" id="submitbtn">提交更新</button>
            </div>
          </div>
        </form>
      </div>
    </div>
  </div>
  <script>
$(function(){
    var text = "balabala"; //要查询的字符串*/
    var demo = $("#demo");
    if($("div.flash").length){
        $("#submitbtn")[0].disabled=true;
        function p(){
            window.setTimeout(function(){
                $.get("/update_output", function(result){
                    if(result.indexOf(text)<0){
                        demo.html(result);
                        p();
                    }else{
                        demo.html(result);
                        $("#submitbtn")[0].disabled=false;
                    }
                });
            },2000);
        }(p());
    }
});
</script>
  <div id="div1"><h2>使用 jQuery修改输出更新记录</h2></div>
  <div id=‘demo‘ style="overflow: auto; height: 245px;"></div>