三、jQuery--jQuery实践--网页定位导航特效

--> --> -->

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一、使用jQuery来实现

css部分

* {
        margin: 0;
        padding: 0;
    }
    
    body {
        font-size: 12px;
        line-height: 1.7;
    }
    
    li {
        list-style: 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: 50px;
    }
    
    #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: #0088bb;
    }
    
    * html,
    * html body {
        background-image: url(about:blank);
        background-attachment: fixed;
    }
    
    * html #menu {
        position: absolute;
        bottom: auto;
        top: expression(100+((e=document.documentElement.scrollTop)?e: document.body.scrollTop)+'px');
    }

View Code

HTML+jQuery部分

<!doctype html>
<html>

<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="css.css">
    <title>地狗购物网-网页定位导航效果</title>
    <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
    <script type="text/javascript">
    $(document).ready(function() {
        $(window).scroll(function() {
            var items = $("#content").find(".item");
            var menu = $("#menu");
            var top = $(document).scrollTop();
            var currentId = ""; //滚动条现在所在位置的item id
            items.each(function() {
                var m = $(this);
                //注意：m.offset().top代表每一个item的顶部位置
                if (top > m.offset().top - 300) {
                    currentId = "#" + m.attr("id");
                } else {
                    return false;
                }
            });

            var currentLink = menu.find(".current");
            if (currentId && currentLink.attr("href") != currentId) {
                currentLink.removeClass("current");
                menu.find("[href=" + currentId + "]").addClass("current");
            }
        });
    });
    </script>
</head>

<body>
    <div id="menu">
        <ul>
            <li><a href="#item1" class="current">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" class="item">
            <h2>1F 男装</h2>
            <ul>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="1F.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item2" class="item">
            <h2>2F 女装</h2>
            <ul>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="2F.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item3" class="item">
            <h2>3F 美妆</h2>
            <ul>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="3F.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item4" class="item">
            <h2>4F 数码</h2>
            <ul>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="4F.png" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item5" class="item">
            <h2>5F 母婴</h2>
            <ul>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="5F.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
    </div>
</body>

</html>

View Code

二、使用JavaScript来实现

<!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: 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: #0088bb;
    }
    /*ie6 hack*/
    
    * html,
    * html body {
        background-image: url(about:blank);
        background-attachment: fixed;
    }
    
    * html #menu {
        /*position: fixed;*/
        position: absolute;
        top: expression(((e=document.documentElement.scrollTop)?e: document.body.scrollTop)+100+'px');
    }
    </style>
    <script>
    //定义getByClassName函数，让函数实现根据class name获取对象并返回

    function getByClassName(obj, cls) {
        var elements = obj.getElementsByTagName("*"),
            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)) {
            //remove
            var reg = new RegExp("(\\s|^)" + cls + "(\\s|$)");
            obj.className = obj.className.replace(reg, "");
        }
    }


    //定义getByClassName函数，让函数实现给对象增加class 

    function addClass(obj, cls) {
        if (!hasClass(obj, cls)) {
            obj.className = "" + cls;
        }
    }


    window.onload = function() {

        window.onscroll = function() {
            var top = document.documentElement ? document.documentElement.scrollTop : document.body.scrollTop;

            var menus = document.getElementById("menu").getElementsByTagName("a");

            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;
                }
            }


            //请补充此处代码，给正确的menu下的a元素class赋值current
            if (currentId) {
                for (var j = 0; j < menus.length; j++) {
                    var _menu = menus[j],
                        _href = _menu.href.split("#");
                    if (_href[_href.length - 1] != currentId) {
                        removeClass(_menu, "current");
                    } else {
                        addClass(_menu, "current");
                    }
                }
            }



        }
    }
    </script>
</head>

<body>
    <div id="menu">
        <ul>
            <!--运用锚点，实现导航定位。-->
            <li><a href="#item1" class="current">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" class="item">
            <h2>1F 男装</h2>
            <ul>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item2" class="item">
            <h2>2F 女装</h2>
            <ul>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item3" class="item">
            <h2>3F 美妆</h2>
            <ul>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item4" class="item">
            <h2>4F 数码</h2>
            <ul>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
        <div id="item5" class="item">
            <h2>5F 母婴</h2>
            <ul>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
                <li>
                    <a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt="" /></a>
                </li>
            </ul>
        </div>
    </div>
</body>

</html>

View Code

posted @ 2015-11-10 14:38 姜腾腾阅读(993) 评论(0) 编辑收藏举报

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