点击导航目录页面滑动到指定div区域

$(document).on("click", ".navbar-nav li[link]", function() {
            nav.find('li').removeClass('active');
            $(this).addClass('active');
            //获取模块到顶部的距离 
            var id = $(this).attr("link")
            //获取顶部导航条高度
            var topH = $("#top-nav").height()
            var divH = $("#" + id).offset().top - topH
            $('html,body').animate({
                scrollTop : divH
            }, 500);

        })

<ul class="nav navbar-nav">
                <li link="div1" class="active"><a href="#">产品展示</a></li>
                <li link="div2"><a href="#">解决方案</a></li>
                <li link="div3"><a href="#">新闻</a></li>
                <li link="div4"><a href="#">帮助中心</a></li>
</ul>
<div id="div1" class="container" style="background: black;"">产品展示</div>
<div id="div2" class="container" style="height: 500px; background-color: blue;">新闻</div>
<div id="div3" class="container" style="height: 500px; background-color: green;">帮助中心</div>
<div id="div4" class="container" style="height: 500px; background-color: gray;">意见反馈</div>

参考 http://www.17sucai.com/pins/demo-show?id=9118