请问一下，我的这段JS怎么没有效果?这段代码我已经对了两次了，还是没有对出来哪里错了，能否帮我看一下是哪里错了<!DOCTYPE html><html><head><meta charset="UTF-8"><title>地狗购物网——网页定位导航效果</title><style>* {margin: 0;padding: 0;} body{ font-size: 12px;line-height: 1.7; }li{list-style-type: none;}#content{width: 800px;margin: 0 auto; padding: 20px;}#content h1{color: #0088bb;}#content .item{padding: 20px;margin-bottom: 20px;border: 1px dotted #0088bb;}#content .item h2{font-size: 16px;font-weight: bold;border-bottom: 2px solid #0088bb;margin-bottom: 10px;}#content .item li{display: inline;margin-right: 10px;}#content .item li a img{width: 230px;height: 230px;border: none;}#menu{position: fixed;top: 100px;left: 50%;margin-left: 400px;width: 80px;}#menu ul li a{display: block;margin: 5px 0;font-size: 14px;font-weight: bold;color: #333;width: 80px;height: 50px;line-height: 50px;text-decoration: none;text-align: center;}#menu ul li a:hover,#menu ul li a.current{color: #fff;background-color: #0088bb;}/* hack */*html,*html body{background-image:url(about:blank);background-attachment:fixed;}* html #menu{position: absolute;top:expression(((e=document.documentElement.scrollTop)?e:document.body.scrollTop)+100+'px');}</style><script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script><script>/*$(document).ready(function() {//滚动条发生滚动$(window).scroll(function() {//在这里，我们做一些事情var top = $(document).scrollTop();var menu = $("#menu");var items = $("#content").find(".item");var currentId = "";//当前所在的楼层（item）IDitems.each(function () {var m = $(this);var itemTop = m.offset().top;if (top>itemTop - 200) {currentId = "#"+m.attr("id");}else{return false;}})//给相应楼层的#，设置current,取消其他链接的current;var currentLink = menu.find(".current");if (currentId && currentLink.attr("href") != currentId) {currentLink.removeClass('current');menu.find("[href=" + currentId + "]").addClass('current');}//console.log(top);});});*///根据className 获取元素function getByClassName(obj,cls) {var elements = obj.getElementsByTagName("*");var result = [];for (var i = 0; i < elements.length; i++) {if (elements[i].className === cls) {result.push(elements[i]);}}return result;}function hasClass(obj,cls) {return obj.className.match(new RegExp("(\\s|^)"+ cls +"(\\s|$)"));}function removeClass(obj,cls) {if( hasClass(obj,cls)){//removevar reg = new RegExp("(\\s|^)"+ cls +"(\\s|$)");obj.className = obj.className.replace(reg,"");}}function addClass(obj,cls) {if (!hasClass(obj,cls)) {obj.className +=" "+cls;}}window.onload = function(){window.onscroll = function(){var top = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;var menus = document.getElementById("menu").getElementsByTagName("a");console.log(menu.length);var items = getByClassName(document.getElementById("content"),"item");var currentId = "";for (var i = 0; i < items.length; i++) {var _item = items[i];var _itemTop = _item.offsetTop;if ( top > _itemTop - 200 ){currentId = _item.id;} else {break;}}if (currentId) {//给正确的menu下的a元素class赋值for (var j = 0; j < menus.length; j++) {var _menu = menus[j];var _href = _menu.href.split("#");if (_href[_href.length-1]!== currentId) {removeClass(_menu,"current");}else{addClass(_menu,"current");}}}};};</script></head><body><div id="menu"><ul><li><a href="#item1">1F 男装</a></li><li><a href="#item2">2F 女装</a></li><li><a href="#item3">3F 美妆</a></li><li><a href="#item4">4F 数码</a></li><li><a href="#item5">5F 母婴</a></li></ul></div><div id="content"><h1>地狗购物网</h1><div id="item1"><h2>1F 男装</h2><ul><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li><li><a href="#"><img src="images/1F.jpg" alt=""></a></li></ul></div><div id="item2"><h2>2F 女装</h2><ul2<li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li><li><a href="#"><img src="images/2F.jpg" alt=""></a></li></ul></div><div id="item3"><h2>3F 美妆</h2><ul><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li><li><a href="#"><img src="images/3F.jpg" alt=""></a></li></ul></div><div id="item4"><h2>4F 数码</h2><ul><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li><li><a href="#"><img src="images/4F.jpg" alt=""></a></li></ul></div><div id="item5"><h2>5F 母婴</h2><ul><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li><li><a href="#"><img src="images/5F.png" alt=""></a></li></ul></div></div></body></html>
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已采纳
堂堂堂堂糖糖糖童鞋
TA贡献101条经验 获得超58个赞
修改一下两处即可：
1、修改
var top = document.documentElement ? document.documentElement.scrollTop : document.body.scrollTop;
为
var top = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;
原因是需要不断监测scrollTop值的变化，来为top 赋值。
2、getByClassName(document.getElementById("content"), "item"); 需要一个 class为 "item" 的元素
<div id="item1" class="item"></div> <div id="item2" class="item"></div> <div id="item3" class="item"></div> <div id="item4" class="item"></div> <div id="item5" class="item"></div>
分别添加 class="item"即可
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