<!--引入jq-->

            <script>

                  var isShowTip = window.sessionStorage.getItem("isShow") ? window.sessionStorage.getItem('isShow') : false;

                  if(!isShowTip) {

                        window.sessionStorage.setItem("isShow", true);

                  } else {

                        document.getElementById("isshow").style.display = 'none';

                  }

                  $("#tipBtn").bind("click", function() {

                        $(".tip-shadow").hide();

                  })

            </script>

         <section class="tip-shadow" id="isshow">

                  <div class="tip-box">

                        <p style="margin-top: 10px; margin-bottom:15px;"></p>

                        <span class="tipBtn" id="tipBtn">我知道了</span>

                  </div>

            </section>