web前端大作业_Html5+CSS3+JS原生项目_京东商城首页详细代码

本文介绍: web 前端大作业 _Html5+CSS3+JS原生项目 _京东商城，模糊查询，京东楼层滚动，京东实现吸顶效果，楼层定位切换，js 实现轮播图

&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
    <meta charset="UTF-8"&gt;
    <meta http-equiv="X-UA-Compatible" content="IE=edge"&gt;
    <meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
    <title&gt;京东</title&gt;
    <!--引入放大镜字体图标（搜索框后面的图标），将下载的东西解压后放入在css文件夹中--&gt;
    <link rel="stylesheet" href="./css/iconfont.css"&gt;
    <!--引入大于小于号字体图标，需新建一个文件夹css1将其下载的东西解压后载入css1文件夹中-->
    <link rel="stylesheet" href="./css1/iconfont.css">

    <link rel="stylesheet" href="./css/index.css">
    <!--引入京东图标-->
    <link rel="icon" href="https://www.jd.com/favicon.ico">
</head>
<body>
    <!--头部开始-->
    <div class="header">
        <div class="wrap header-box">
            <div class="login">
                <a href="首页.html"><img src="./images/sprite.png"></a>
            </div>
            <div class="search">
                <div class="search-m">
                    <!-- 吸顶时用的小图标 -->
                    <div class="search-login"></div>
                     <div class="form">
                        <input type="text" class="keyword" placeholder="苹果手机">
                        <button class="iconfont">&#xe6e4;</button>
                        <div class="search-helper"></div>
                     </div>
                </div>
            </div>
            <div class="hotwords">
            
               <a  href="javascript:;" style="width:60px; color:#e1251b;">美妆护肤类</a></li>
                <a href="javascript:;"  style="width:48px;">新风空调</a>
                <a href="javascript:;"style="width:48px;">春款女装</a>
                <a href="javascript:;"style="width:48px;">真我新品</a>
                <a href="javascript:;"style="width:48px;">电视直降</a>
               <a href="javascript:;"style="width:48px;">新潮电脑</a>
                <a href="javascript:;"style="width:48px;">美妆护肤</a>
            
            </div>
            <div class="navitems">
                <ul>
                    <li style="width:82px;"><a href="javascript:;">京东超市</a></li>
                    <li style="width:52px;"><a href="javascript:;">秒杀</a></li>
                    <li style="width:82px;"><a href="javascript:;">便宜包邮</a></li>
                    <li style="width:82px;"><a href="javascript:;">京东生鲜</a></li>
                    <li style="width:82px;"><a href="javascripts:;">进口好物</a></li>
                    <li style="width:82px;"><a href="javascriptd:;">京东家电</a></li>
                    <li style="width:89px;"><a href="javascript:;">PLUS会员</a></li>
                    <li style="width:52px;"><a href="javascript:;">拍卖</a></li>
                </ul>
            </div>
            
            
        
    </div>
    <!--头部结束-->
    <!--轮播图开始-->
    <div class="banner">
        <div class="left">
            <ul>
                <li><a href="javascript:;">家用电器</a></li>
                <li>
                <a href="javascript:;">手机</a>
                <span>/</span>
                <a href="javascript:;">运营商</a>
                <span>/</span>
                <a href="javascript:;">数码</a> 
                </li>
                <li>
                <a href="javascript:;">电脑</a>
                <span>/</span>
                <a href="javascript:;">办公</a>
                </li>
                <li>
                <a href="javascript:;">家居</a>
                <span>/</span>
                <a href="javascript:;">家具</a>
                <span>/</span>
                <a href="javascript:;">家装</a>
                <span>/</span>
                <a href="javascript:;">厨具</a>
                </li>
                <li>
                <a href="javascript:;">男装</a>
                <span>/</span>
                <a herf="javascript:;">女装</a>
                <span>/</span>
                <a href="javascript:;">童装</a>
                <span>/</span>
                <a href="javascript:;">内衣</a>
                </li>
                <li>
                <a href="javascript:;">美妆</a>
                <span>/</span>
                <a href="javascript:;">个护清洁</a>
                <span>/</span>
                <a href="javascript:;">宠物</a>
                </li>
                <li>
                <a href="javascript:;">女鞋</a>
                <span>/</span>
                <a href="javascript:;">箱包</a>
                <span>/</span>
                <a href="javascript:;">钟表</a>
                <span>/</span>
                <a href="javascript:;">珠宝</a>
                </li>
                <li>
                <a href="javascript:;">男鞋</a>
                <span>/</span>
                <a href="javascript:;">运动</a>
                <span>/</span>
                <a href="javascript:;">户外</a>
                </li>
                <li>
                <a href="javascript:;">房产</a>
                <span>/</span>
                <a href="javascript:;">汽车</a>
                <span>/</span>
                <a href="javascript:;">汽车用品</a>
                </li>
                <li>
                <a href="javascript:;">母婴</a>
                <span>/</span>
                <a href="javascript:;">玩具乐器</a>
                </li>
                <li>
                <a href="javascript:;">食品</a>
                <span>/</span>
                <a href="javascript:;">酒类</a>
                <span>/</span>
                <a href="javascript:;">生鲜</a>
                <span>/</span>
                <a href="javascript:;">特产</a>
                </li>
                <li>
                <a href="javascript:;">艺术</a>
                <span>/</span>
                <a href="javascript:;">礼品鲜花</a>
                <span>/</span>
                <a href="javascript:;">农牧园艺</a>
                </li>
                <li>
                <a href="javascript:;">医药保健</a>
                <span>/</span>
                <a href="javascript:;">计生情趣</a>
                </li>
                <li>
                <a href="javascript:;">图书</a>
                <span>/</span>
                <a href="javascript:">文娱</a>
                <span>/</span>
                <a href="javascript:;">教育</a>
                <span>/</span>
                <a href="javascript:;">电子书</a>
                </li>
                <li>
                <a href="javascript:;">机票</a>
                <span>/</span>
                <a href="javascript:;">酒店</a>
                <span>/</span>
                <a href="javascript:;">旅游</a>
                <span>/</span>
                <a href="javascript:;">生活</a>
                <span>/</span>
                </li>
                <li>
                <a href="javascript:;">支付</a>
                <span>/</span>
                <a href="javascript:;">白条</a>
                <span>/</span>
                <a href="javascript:;">保险</a>
                <span>/</span>
                <a href="javascript:;">企业金融</a>
                </li>
                <li>
                <a href="javascript:;">安装</a>
                <span>/</span>
                <a href="javascript:;">维修</a>
                <span>/</span>
                <a href="javascript:;">二手</a>
                </li>
                <li>
                <a href="javascript:;">工业品</a>
                <span>/</span>
                <a href="javascript:;">元器件</a>
                </li>
            </ul>

        </div>
        <div class="wrap banner-box">
            <div class="banner-slide">
                <div class="slide">
                    <!--javascript:点击没有任何操作，不会跳转-->
                    <a href="javascript:;"><img class="img" src="./images/1.jpg"></a>
                    
                    <a href="javascript:;" class="prev"><span class="iconfont"></span></a>
                    <a href="javascript:;" class="next"><span class="iconfont"></span></a>
                   <ul class="banner-btn">
                    <li class="active"></li>
                    <li></li>
                    <li></li>
                    <li></li>
                    <li></li>
                    <li></li>
                    <li></li>
                    <li></li>
                  </ul>
                </div>
            </div>
        </div>
        <div class="right">
            <div class="j-user">
                <div class="j-userimg">
                    <a class="user-lk" href="javascript:;"><img src="./images/xiazai.png"></a>
                </div>
                <div class="user-show">
                    <a href="javascript:;" style="width:94px;height:16px;">Hi~欢迎逛京东！</a><br>
                   <!-- <p style="width:106px; height:20px;"> -->
                    <a href="javascript:;" style="width:24px;height:16px;">登录</a>
                    <span>|</span>
                    <a href="javascript:;" style="width:24px;height:16px;">注册</a>
                <!-- </p>  -->
                </div>
            </div>
            <div class="user-profit">
                <a class="user-profit1" href="javascript:;">新人福利</a>
                <a  class="user-profit2" href="javascript:;">PLUS会员</a>
            </div>
            <hr>
            <div class="J-news">
                <div class="news-hd">
                    <h5>京东快报&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="javascript:;" >更多</a></h5>
                    
                </div>
                <ul class="new-list">
                    <li class="new-items">
                        
                        <a href="javascript:;"><span class="new-tag">热议</span>华硕灵耀14&nbsp;&nbsp;&nbsp;&nbsp;2023:&nbsp;&nbsp;&nbsp;2.8k&nbsp;&nbsp;OLED高刷屏轻薄本</a>
                    </li>
                    <li  class="new-items"><a href="javascript:;"><span class="new-tag1">热议</span>强健肠道才是正经事，过来人宝妈真心话</a></li>
                    <li  class="new-items"><a href="javascript:;"><span class="new-tag2">热议</span>每次点点机器就可以喝到鲜活的水,非常的开心！</a></li>
                    <li  class="new-items"><a href="javascript:;"><span class="new-tag3">热议</span>200000转风扇看得见!红魔8 pro+透明体验</a></li>

                </ul>
                <hr>
                <div class="grid-container">
                    <div id="grid-items">
                        <a href="javascript:;">
                            <img src="./images/a.png">
                            <span class="service-txt">企业购</span>
                        </a>

                    </div>
                    <div id="grid-items">
                        <a href="javascript:;">
                            <img src="./images/c.png">
                            <span class="service-txt">礼品卡</span>
                        </a>
                    </div>
                    <div id="grid-items">
                        <a href="javascript:;">
                            <img src="./images/g.png">
                            <span class="service-txt">话费卡</span>
                        </a>
                    </div>
                    <div id="grid-items">
                        <a href="javascript:;">
                            <img src="./images/d.png">
                            <span class="service-txt">白条卡</span>
                        </a>
                    </div>
                    <div id="grid-items">
                        <a href="javascript:;">
                            <img src="./images/e.png">
                            <span class="service-txt">游戏卡</span>
                        </a>
                    </div>
                    <div id="grid-items">
                        <a href="javascript:;">
                            <a href="javascript:;">
                            <img src="./images/f.png">
                            <span class="service-txt">游戏卡</span>
                        </a>
                    </div>
                </div>

            </div>
        
        
       </div>

    </div>

    <!--轮播图结束-->

    <!--主体开始-->
    <div class="content">
        <div class="wrap">
            <div class="miaosha item">京东秒杀</div>
            <div class="youxuan item">特色优选</div>
            <div class="guangchang item">频道广场</div>
            <div class="tuijian item">为你推荐</div>
        </div>
        <div class="elevator">
            <a href="javascrit:">京东<br>秒杀</a>
            <a href="javascript:">特色<br>优选</a>
            <a href="javascript:">频道<br>广场</a>
            <a href="javascript:">为你<br>推荐</a>
        </div>
    </div>
    <!--主体结束-->

    
    


    <!--引入js文件-->
    <script src="./js/index.js"></script>
</body>
</html>

css

index.css

/*头部开始*/
.header{
   width:100%;
   height:140px;
   border-bottom:1px solid #ddd;
   /* background-color:palegoldenrod; *//*黄色*/
   background-color:white;
}
.wrap{
    width:1190px;
    margin:0 auto;
   
    
    
}
.header-box{
    height:140px;
    /* background-color:aqua; *//*蓝色*/
    position: relative;
    
}
.login{
    position: absolute;
    height:120px;
    width:190px;
    background:url("../images/sprite.png") no-repeat;
    top:10px;
    left:0;
    /*将超出区域的内容隐藏*/
    overflow: hidden;

}
.search{
    height:60px;
    width:1190px;
}
.search-m{
    height:60px;
    width:1190px;
    position: relative;
    margin:0 auto;
}
.search-login{
    height:40px;
    width:125px;
    position: absolute;
    top:4px;
    display:none;/*隐藏状态，只有吸顶时出现*/
    left:0;
    background:url("../images/sprite.png") no-repeat;
    background-position: 0 -120px;/*第一个值为x轴（水平）位置，第二值为y轴（垂直）位置*/
}
.form{
    
    width:546px;
    height:32px;
    border:2px solid #e2231a;
    position: absolute;
    top:25px;
    left:260px;
    background:#fff;
}
.keyword{
    height:25px;
    width:425px;
    padding:2px 44px 2px 17px;
    line-height:26px;
    border:2px solid transparent;/*透明色*/
    font-size:12px;
    color:#333;
    position: absolute;
    top:0;
    outline: none;/*去掉文本框默认的黑色边框*/
}
.form button{
    width:58px;
    height:32px;
    position: absolute;
    right:0;
    line-height:32px;
    border:none;/*去掉按钮默认的边框*/
    background-color: #e1251b;
    font-size:20px;
    font-weight:700px;
    color:white;
    cursor: pointer;/*鼠标放上去变小手*/
}
.form button:hover{
    background-color:#e1251b8d ;
}
.search-helper{
    width:488px;/*高度由内容撑起*/
    position: absolute;
    top:35px;
    border:1px solid #ccc;
    overflow:hidden;/*溢出部分隐藏*/
    display:none; /*隐藏状态*/
    background-color:#fff;
    box-shadow: 1px 2px 1px rgb(0 0 0/20%) ;
}
.search-helper p{
    font-size:12px;
    height:24px;
    line-height:24px;
    padding:1px 6px;/*上下1像素，左右6像素*/
    cursor: pointer;/*鼠标放上去变小手*/
    color:#666;
}
.search-helper p:hover{
    background-color: #ccc;
}
.hotwords{
   width:450px;
   height:20px;
   position:absolute;
   top:68px;
   left:260px;
   line-height:20px;
   

}

.hotwords a{
    float:left;
    list-style-type: none;
    height:20px;
    font-size:12px;
    margin-left:8px;
    text-decoration: none;
    color:#4f4c4c;
    

}
 .hotwords a:hover{
    color:#e1251b;
}
.navitems{
    position:absolute;
    width:800px;
    height:60px;
    top:88px;
    left:220px;
   
    
}
.navitems li{
    height:40px;
    line-height:40px;
    font-size:14px;
    list-style-type: none;
    float:left;
    
}
.navitems a{
    text-decoration: none;
    color:rgba(0, 0, 0, 0.848);
}
.navitems a:hover{
    color:#e1251b;
}
 







/*头部结束*/
body{
    background-color:#f4f4f4;
}
/*轮播图开始*/
.left{
    width:220px;
    height:470px;
    position: absolute;
    top:10px;
    left:110px;
    background-color:white;

}
.left li{
    width:100%;
    height:25px;
    list-style-type: none;
    margin-left:-10px;

}
.left a{
    font-size:14px;
    cursor: pointer;
    text-decoration: none;
    color:black;
}
.left a:hover{
    color:red;
}
.banner{
    height:470px;
    width:100%;
    padding-top:10px;
    margin-bottom:30px;
    /* background-color: coral; *//*橘黄色*/
    position:relative;
}
.banner-box{
    height:470px;
    /* background-color:crimson; *//*红色*/
}
.banner-slide{
    width:740px;
    height:470px;
    /* background-color: chartreuse;/*草绿色*/
    margin:0 auto; 

}
.slide{
    width:590px;
    height:470px;
    /* background-color:cyan; *//*蓝色*/
    position:relative;
}
.prev,.next{
    position:absolute;
    top:50%;
    margin-top:-20px;
    height:35px;
    width:25px;
    line-height:35px;
    background-color: rgba(0,0,0,.15);
    font-size:20px;
    cursor:pointer;
    
}
.prev{
    left:0;
    border-radius:0 18px 18px 0;
}
.next{
    right:0;
    border-radius:18px 0 0 18px;
}
.slide  a{ 
    text-decoration: none;
}
.prev:hover{
    background-color:#666;
}
.next:hover{
    background-color: #666;
}
span:hover{/*鼠标悬停*/
    color:red;
}
span:active{/*打击*/
    color:black;
}
.banner-btn{
    width:113px;
    height:15px;
    position: absolute;
    left:30px;
    bottom:20px;

}
.banner-btn li{
    float:left;
    
    width:8px;
    height:8px;
    list-style: none;/*不显示列表项默认的图标*/
    margin-right:4px;
    border:1px solid rgba(0,0,0,.05);
    border-radius: 50%;/*圆*/
    background-color:rgba(255,255,255,.4);
    cursor: pointer;
  
}
.banner-btn  .active{
   
    border:3px solid rgba(0,0,0,.1); 
    background-color: rgba(255,255,255,1);


}
.right{
    width:370px;
    height:470px;
    background-color:white;
    position:absolute;
    top:10px;
    right:110px;
    margin:0 auto;

}
.j-user{
    height:102px;
    margin-top:10px;
    position:relative;

}
.j-userimg{
    height:44px;
    width:44px;
    position:absolute;
    top:13px;
    left:80px;
   
}
.user-lk{
    border:2px solid #fff;
    border-radius: 50%;
    overflow: hidden;
    box-shadow:0 2px 8px rgb(0 0 0/5%);
    color:#666;
    text-decoration: none;
}
.user-lk,.user-lk img{
    display:block;
    width:40px;
    height:40px;

}
.user-show{
    width:106px;
    height:38px;
    position:absolute;
    top:16px;
    left:150px;
    right:20px;
    line-height: 20px;;
}
.user-show a{
    font-size:12px;
    color:#666;
    text-decoration: none;
}
.user-show a:hover{
    color:#e1251b;
    cursor:pointer;
}
.user-profit{
    width:370px;
    height:25px;
    margin-left: 80px;
    margin-top:-10px;

}
.user-profit1 {
    background-color:#e1251b; 
    color:white; 
    width:100px;
    height:25px;
    line-height:25px;
    
    text-align:center;
    
}
.user-profit2{
    height:25px;
    width:100px;
    line-height:25px;
    
    text-align:center;
   
    background: #363634;
    color: #e5d790;

}
.user-profit a{
    text-decoration: none;
    margin-left:15px;
    font-size:13px;
    border-radius:13px;
    font-weight: blod;
    margin-top:-5px;
}


.user-profit a:hover{
    color:#4a0703;
    cursor:pointer;
}
.J-news{
    height:129px;
    width:100%;
   
}
.news-hd{
    height:30px;
}
 .news-hd h5 a{
    text-decoration: none;
    color:#333333b4;
}
.news-hd a:hover{
    color:#c8140b;
}
.new-list{
    width:320px;
    height:88px;
    list-style-type: none;
   
    line-height:88px;
    margin:0 auto;
    position:relative;
}
.new-items{
    width:320px;
    height:16px;
    
    margin-top:6px;
    line-height:16px;
   
}
.new-items a{
    text-decoration: none;
    font-size:14px;
    color:#666;
}
.new-items a:hover{
    color:#a9120a;
}
.new-tag{
    width:35px;
    height:16px;
    position: absolute;
    top:0;
    left:2px;
    background-color:rgba(255, 192, 203, 0.74);
    color:rgba(255, 0, 0, 0.788);
    font-size:14px;
}
.new-tag1{
    width:35px;
    height:16px;
    position:absolute;
    top:22px;
    left:2px;
    background-color:rgba(255, 192, 203, 0.74);
    color:rgba(255, 0, 0, 0.788);
    font-size:14px;

}
.new-tag2{
    width:35px;
    height:16px;
    position:absolute;
    top:44px;
    left:2px;
    background-color:rgba(255, 192, 203, 0.74);
    color:rgba(255, 0, 0, 0.788);
    font-size:14px;
}
.new-tag3{
    width:35px;
    height:16px;
    position:absolute;
    top:66px;
    left:2px;
    background-color:rgba(255, 192, 203, 0.74);
    color:rgba(255, 0, 0, 0.788);
    font-size:14px;
}
.grid-container{
    width:360px;
    height:170px;
    
   
    display:grid;
    Grid-template-rows:1.5fr 1.5fr;
    Grid-template-columns:1fr 1fr 1fr;
}
#grid-items{
    
    text-align:center;
    position: relative;
}
#grid-items img{
    height:40px;
    width:40px;
}
.service-txt{
  position:absolute;
  top:45px;
  left:37px;
}

.grid-container a{
    text-decoration: none;
    color:#36363495;
}
/*轮播图结束*/
/*主体开始*/
.content{
    width:100%;
    text-align:center;
    position: relative;

}
.miaosha{
    width:100%;
    height:260px;
    background-color:bisque;
    margin-bottom:20px;
    z-index: 10;
}
.youxuan{
    height:980px;
   width:100%;
   background-color:chartreuse;
   margin-bottom:20px;

}
.guangchang{
   height:1005px;
   width:100%;
background-color: cornflowerblue;
margin-bottom:20px;
}
.tuijian{
height:1870px;
width:100%;
background-color: darkolivegreen;
margin-bottom:20px;
}
.elevator{
    width:58px;
    height:252px;
    
    position:absolute;
    top:0;
    left:50%;
    margin-left:615px;
}
.elevator-fix{
    position:fixed;
    top:75px; 
    animation:eleshow 0.5s ease;
}
@keyframes eleshow {
    0%{
        top:0;
    }
    100%{
        top:75px;
    }
    
}
.elevator a{
    display:block;/*让每个a标签独占一行*/
    height:38px;
    width:58px;
    border-bottom: 2px solid #cccccc7e;
    text-decoration: none;
    line-height:19px;/*一行字占19像素*/
    font-size:14px;
    color:#333;
    padding-top: 10px;
    padding-bottom:10px;
    transition: color 0.2s ease;
    background-color: #fff;
    


}
.elevator a:hover{
    color:white;
    background-color:#e1251b;
}
/*吸顶*/
.search-fix{
    position:fixed;
    left:0;
    top:0;
    width:100%;
    z-index: 10;
    border-bottom:2px solid #f10214;
    background-color:#fff;
    box-shadow:2px 2px 2px rgb(0 0 0/20%);
    animation: searchTop 0.5 ease;


}
@keyframes searchTop {
    0%{
        top:-50px;
    }
    100%{
        top:0px;
    }
    
}
/*主体结束*/

index.js

//实现模糊查询
var keyword=document.querySelector('.keyword');//获取输入框

var searchHelper=document.querySelector('.search-helper');//获取搜索框下的文本框
//定义数组，存储搜索的内容
var searchArr=new Array("小米手机","华为手机","苹果手机","小米电视","小米平板","苹果12","苹果13","苹果手表");

//给输入框绑定内容改变事件
keyword.oninput=function(){
    searchHelper.innerHtml='';
for(let i=0;i<searchArr.length;i++){
    if(searchArr[i].indexOf(keyword.value)!=-1){//!=-1代表有数组中的字
        searchHelper.innerHTML+='<p>'+searchArr[i]+'</p>';
        searchHelper.style.display="block";//显示搜索框下的文本框

    }
}
}
//鼠标失焦onblur
keyword.onblur=function(){
    searchHelper.style.display="none";//不显示搜索框下的文本框

}
//实现轮播图的切换
 var img=document.querySelector('.img');
 var imgArr=['1.jpg','2.jpg','3.jpg','4.jpg','6.jpg','5.jpg','7.jpg','8.jpg'];
 
 var count=0;
//定义一个函数，用来切换图片的路径
function cutImg(){
    img.src='./images/'+imgArr[count];
    /*设置圆点激活状态 */
    for(let i=0;i<lis.length;i++){
        //下面两种方式都可以实现
        // lis[i].classList.remove("active");
        lis[i].className='';

    }
   //lis[count].classList.add("active");
   lis[count].className='active';
}
//设置定时器，每隔3s切换图片
var timer=setInterval(function(){
    count++;
    if(count>imgArr.length-1){//判断是否加到最后一张图片了
        count=0;
    }
    cutImg();

},2000)
var next=document.querySelector('.next');
var prev=document.querySelector('.prev');
//点击下一张
next.onclick=function(){
    count++;
    if(count>imgArr.length-1){
        count=0;
    }
    cutImg();

}
//点击上一张
prev.onclick=function(){
    count--;
    if(count<0){//判断是否减到第一张图片了
        count=imgArr.length-1;
    }
    cutImg();
}
//鼠标滑进之后图片不在切换，滑出之后图片切换
var slide=document.querySelector('.slide');

//鼠标滑进,将定时切换图片给取消
slide.onmouseover=function(){
    clearInterval(timer);
}
//鼠标滑出，启动定时切换图片
slide.onmouseout=function(){
    timer=setInterval(function(){
        count++;
        if(count>imgArr.length-1){//判断是否加到最后一张图片了
            count=0;
        }
        cutImg();
    
    },2000)
}
//给所有的li绑定点击事件
var lis=document.querySelectorAll('.banner-btn li');
for(let i=0;i<lis.length;i++){
    lis[i].onclick=function(){
    count=i;
    cutImg();
    }

}
//实现楼层elevator的定位切换
let header=document.querySelector('.header');
let  banner=document.querySelector('.banner');
let elevator=document.querySelector('.elevator');


//实现楼层滚动，文字变色的效果
 //获取content中的所有div
let items=document.querySelectorAll('.content .item');
 //获取所有a
let elevatorA= document.querySelectorAll('.elevator a');
let elevatorArr=[];//数组中放四个值，从头开始到京东秒杀结束的高度，从开始到特色优选结束的高度，从开始到频道广场结束的高度，从开始到为你推荐的高度
let base=header.offsetHeight+banner.offsetHeight;
for(let i=0;i<items.length;i++){
    base=base+items[i].offsetHeight;//当i=0时，base的值为京东秒杀的高度
    elevatorArr.push(base);//将base的值放入到elevatorArr数组中
}
function clearcolor(){
    for(let i=0;i<elevatorA.length;i++){
        elevatorA[i].style.color='';
    }
}
//获取search的值
let search=document.querySelector('.search');
//获取search-m的值
let searchM=document.querySelector('.search-m');
//获取form的值
let form=document.querySelector('.form');
//获取search-login的值
let searchLogin=document.querySelector('.search-login');

document.onscroll=function(){
    //获取滚动条垂直方向滚动了多少
 let top= document.documentElement.scrollTop;
     //document.body.scrollTop
    //获取到header的高度
    //clientHeight包括其height和上下内边距padding.不包括其边框;
    //header.clientHeight;
    //offsetHeight包括其height,上下内边距padding和其边框;
    let headerHeight= header.offsetHeight;
    //获取到banner的高度
    let bannerHeight=banner.offsetHeight;
    //当滚动条滚动到一定程度时,将楼层elevator的定位由绝对定位切换成固定定位
    if(top>=headerHeight+bannerHeight){
        // elevator.className="elevator elevator-fix";
        elevator.classList.add("elevator-fix");
        search.classList.add('search-fix');//当高度达到一定高度时，出现吸顶效果
        searchM.style.height="50px";//将search-m的高度改为50px;
        form.style.top='8px';//将form距离浏览器上方的值改为8px;
        searchLogin.style.display="block";//吸顶时，显示小图标
       
        
    }else{
        elevator.classList.remove("elevator-fix");
        search.classList.remove('search-fix');
        searchM.style.height="60px";
        form.style.top='25px';
        searchLogin.style.display="none";
       
    }
    //实现楼层字体颜色的切换
    //京东秒杀：亮起来
 //滚动条的高度>=header的高度+banner的高度
 //滚动条的高度<header的高度+banner的高度+京东秒杀的高度


 //特色优选：亮起来
//滚动条的高度>=header的高度+banner的高度+京东秒杀的高度
//滚动条的高度<header的高度+banner的高度+京东秒杀的高度+特色优选的高度

//频道广场：亮起来
//滚动条的高度<header的高度+banner的高度+京东秒杀的高度+特色优选的高度
//滚动条的高度<header的高度+banner的高度+京东秒杀的高度+特色优选的高度+频道广场的高度


//为你推荐：亮起来
//滚动条的高度<header的高度+banner的高度+京东秒杀的高度+特色优选的高度+频道广场的高度
//滚动条的高度<header的高度+banner的高度+京东秒杀的高度+特色优选的高度+频道广场的高度+为你推荐的高度


  if(top<headerHeight+bannerHeight){
        clearcolor();

  }else  if(top>=headerHeight+bannerHeight&&top<elevatorArr[0]){
        //注意不能直接使用base，因为base的值已经发生改变,这里需要用header.offsetHeight+banner.offsetHeight
       clearcolor();
     elevatorA[0].style.color='red';

 }else if(top>=elevatorArr[0]&&top<elevatorArr[1]){
    clearcolor();
    elevatorA[1].style.color='red';

 }else if(top>=elevatorArr[1]&&top<elevatorArr[2]){
    clearcolor();
    elevatorA[2].style.color='red';
 }else if(top>=elevatorArr[2]){
    clearcolor();
    elevatorA[3].style.color='red';
 }


}