/**
* @author xiaohejun
* Man Always Remember Love Because of Romance Only.
*
*/
先看效果
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>购物网站</title>
<link rel="stylesheet" type="text/css" href="css/demo.css">
<script src="js/jquery-3.2.1.js" rel="script"></script>
<script src="js/demo.js" rel="script"></script>
</head>
<body>
<!-- 菜单 -->
<div id="menu">
<ul>
<li><a href="#item1" class="current">1F 一楼</a></li>
<li><a href="#item2">2F 二楼</a></li>
<li><a href="#item3">3F 三楼</a></li>
<li><a href="#item4">4F 四楼</a></li>
<li><a href="#item5">5F 五楼</a></li>
</ul>
</div>
<div id="content">
<h1>天狗购物</h1>
<div id="item1" class="item">
<h2>1F 男装</h2>
<ul>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
<li><a href="#"><img src="images/1.png" alt="1"></a></li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
<li><a href="#"><img src="images/2.jpg" alt="2"></a></li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美妆</h2>
<ul>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
<li><a href="#"><img src="images/3.jpg" alt="3"></a></li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
<li><a href="#"><img src="images/4.png" alt="4"></a></li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
<li><a href="#"><img src="images/5.png" alt="5"></a></li>
</ul>
</div>
</div>
</body>
</html>
##样式 css/demo.css
* {
margin:0px;
padding: 0px;
}
body {
font-size: 12px;
line-height: 1.7;
}
li {
list-style: none;
}
#content {
width: 800px;
margin: 0 auto;
padding: 20px;
}
#content h1 {
color: red;
}
#content .item {
padding: 20px;
margin-bottom: 20px;
border: 1px dotted red;
}
#content .item h2 {
font-size: 16px;
font-weight: bold;
border-bottom: 2px solid red;
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: #ffffff;
background: red;
}
动作操作 js/demo.js
/**
* Created by 何军 on 2017/8/7.
* 使用jquery
*/
$(document).ready(function () {
// 滚动条发生滚动
$(window).scroll(function () {
// 滚动挑距离顶部的距离
var top = $(document).scrollTop();
// 获取menu
var menu = $("#menu");
// 获取每一个框
var items = $("#content").find(".item");
var currentId = ""; // 当前的id
items.each(function () { // 遍历每一个item
var m = $(this); // 取得当前对象
var itemTop = m.offset().top; // 获得当前item的距离顶位置
if(top > itemTop-200){ // 如果用户滚动的距离比当前item的距离顶部位置少200px
currentId = "#" + m.attr("id"); // 设置currentId 为当前id
} else {
return false; // 过头了。直接返回false退出循环
}
});
var currentLink = menu.find(".current"); // 找到class是current的导航。初始是item1
if(currentId && currentLink.attr("href") !== currentId){ // 如果currentId不是空并且当前导航的href不是当前的id
currentLink.removeClass("current"); // 移走current的Class
// 注意此处查找方法的字符串拼接。currentId要用引号
menu.find("[href=\"" + currentId +"\"]").addClass("current"); // 找到currentId的导航加上current的class
}
});
});
/*
// 使用原生的js
window.onload = function () {
window.onscroll = function () {
var top = document.documentElement ? document.documentElement.scrollTop : document.body.scrollTop;
var menus = document.getElementById("menu").getElementsByTagName("a");
var items = getByClassName(document.getElementById("content"), "item");
var currentId = "";
for(var i =0; i < items.length; i++) {
var _item = items[i];
var _itemTop = _item.offsetTop;
if (top > _itemTop - 200) {
currentId = _item.id;
} else {
break;
}
}
if(currentId) {
// 给正确的menu的a元素current赋值
for (var i = 0; i < menus.length; i++) {
var _menu = menus[i];
var _href = _menu.href.split("#");
if (_href[_href.length-1] !== currentId) {
console.log(_href[_href.length-1]);
removeClass(_menu, "current");
} else {
addClass(_menu, "current");
}
}
}
}
}
function getByClassName(obj,cls) {
var elements = obj.getElementsByTagName("*");
var result = [];
for (var i=0; i < elements.length; i++) {
if(elements[i].className === cls) {
result.push(elements[i]);
}
}
return result;
}
function hasClass(obj, cls) {
return obj.className.match(new RegExp("(\\s|^)" + cls + "(\\s|$)"));
}
function removeClass(obj, cls) {
if (hasClass( obj, cls)) {
var reg = new RegExp("(\\s|^)" + cls + "(\\s|$)");
console.log("cls=");
console.log(cls);
obj.className = obj.className.replace(reg," ");
}
}
function addClass(obj, cls) {
if (!hasClass(obj, cls)) {
obj.className += " " + cls;
}
}*/