ecstore导航吸顶功能，在导航父元素中加入id，如：
1 <div id="mainNav1"></div>
在footer.html中添加以下js代码:
1 <script type="text/javascript">function getTop(e) 2 { 3 var offset=e.offsetTop; 4 if(e.offsetParent!=null) //只要还有父元素,也就是当前元素不是根节点就继续往上累计元素的高度 5 offset+=getTop(e.offsetParent); 6 return offset; 7 } 8 var myBlockTop = getTop(document.getElementById("mainNav1")); 9 var oneDiv=document.getElementById("mainNav1"); 10 if(!!window.attachEvent)//ie浏览器下。 11 { 12 window.attachEvent('**croll',function(){ 13 if(document.documentElement.scrollTop/* + (document.body.clientHeight || window.innerHTML) */>= myBlockTop) 14 {oneDiv.style.position="fixed";oneDiv.style.top="0";oneDiv.style.left="0";oneDiv.style.display="block";oneDiv.style.zIndex="9999999999999";oneDiv.style.height="35px";oneDiv.innerHTML = document.getElementById("mainNav").innerHTML; } 15 else{oneDiv.style.display="none";} 16 17 }); 18 } 19 if(!!window.addEventListener)//非ie浏览器下 20 { 21 window.addEventListener("scroll",function(){//document.body.scrollTop可保证chrome的正常。 22 if(document.documentElement.scrollTop/* + (document.body.clientHeight || window.innerHTML) */>= myBlockTop||document.body.scrollTop>=myBlockTop) 23 {oneDiv.style.position="fixed";oneDiv.style.top="0";oneDiv.style.width="100%";oneDiv.style.zIndex="9999999999999";oneDiv.style.display="block";oneDiv.style.height="35px";oneDiv.innerHTML =document.getElementById("mainNav").innerHTML;} 24 else{oneDiv.style.display="none";} 25 }); 26 }</script>
测试看看效果吧~