滑动滚轮到某位置，导航字的下方红色杠杠不跟随红色文字，要怎么改？

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JS实战</title>
    <link rel="stylesheet" type="text/css" href="./css/index.css" />
    <link rel="stylesheet" type="text/css" href="./css/base.css" />
    <link rel="stylesheet" type="text/css" href="./css/animate.css" />
 
</head>
<body>
    <!-- 头部 -->
    <header class="header">
        <div class="header__logo">H5实战页面</div>
        <div class="header__nava">
            <!-- 导航项 -->
            <a href="javascript:;" class="header__nava-item ">实战课程</a>
            <a href="javascript:;" class="header__nava-item">商业案例</a>
            <a href="javascript:;" class="header__nava-item">课程体系</a>
            <a href="javascript:;" class="header__nava-item">集成环境</a>
            <a href="javascript:;" class="header__nava-item">云端学习</a>
            <!-- 导航项按钮 -->
            <a href="javascript:;" class="header__nava-item_custom_buttom">即刻学习</a>
            <div class="header__nav-tip"></div>
            </div>
    </header>
    <!-- 屏幕1 -->
    <div class="screen1">
             <!-- 屏幕1标题1 -->
             <h2 class="screen1__heading screen1__heading_animate_init">实战课程重磅上线</h2>
             <!-- 屏幕2标题2 -->
             <h4 class="screen1__subheading screen1__subheading_animate_init">一键云学习，还在等什么？</h4>
 
 
    </div>
    <!-- 屏幕2 -->
    <div class="screen2">
        <!-- 网页内容容器 -->
        <div class="screen__wrap">
            <!-- 屏幕2标题1 -->
        <h2 class="screen2__wrap__heading screen2__wrap__heading_animate_init">每门课都是真实商业案例</h2>
        <div class="screen2__wrap__heading__line screen2__wrap__heading__line_animate_init"></div>
            <!-- 屏幕2标题2 -->
        <h5 class="screen2__wrap__subheading screen2__wrap__subheading_animate_init">真实案例，真实场景,在实战中实践、操作调试<br>大牛带你体验BAT真实开发流程，所有开发过程一一为你呈现</h5>
            <!-- 屏幕2图片项 -->
        <div class="screen2__warp_img-item">
            <div class="screen2__wrap__img-item__bg-1"></div>
            <div class="screen2__wrap__img-item__bg-2 screen2__wrap__img-item__bg-2_animate_init"></div>
            <div class="screen2__wrap__img-item__bg-3 screen2__wrap__img-item__bg-3_animate_init"></div>
        </div>
        </div>
    </div>
    <!-- 屏幕3 -->
    <div class="screen3">
        <!-- 容器 -->
        <div class="screen__wrap">
            <!-- 屏幕3图片 -->
            <div class="screen3__img__bg-1"></div>
            <!-- 屏幕3标题1 -->
            <h2 class="screen3__heding">强大的语言课程体系支持</h2>
            <div class="screen3__heading__line"></div>
            <!-- 屏幕3标题2 -->
            <h3 class="screen3__subheding">学习环境与课程轻松对接，安装、调试、写入、部署、运行，一站式解决<br>，让你体验开发流程</h3>
            <div class="screen3__inner">
                <div class="screen3__inner-1">HTML5</div>
                <div class="screen3__inner-2">PHP</div>
                <div class="screen3__inner-3">JAVA</div>
                <div class="screen3__inner-4">Python</div>
                <div class="screen3__inner-5">Node.JS</div>
            </div>
        </div>
    </div>
    <!-- 屏幕4 -->
    <div class="screen4">
        <div class="screen__wrap">
            <h2 class="screen4__wrap__heading">省去本地复杂的环境搭建</h2>
            <div  class="screen4__wrap__heading__line"></div>
            <h3 class="screen4__wrap__subheading">你可以告别在虚拟机中调试开发了</h3>
            <div class="screen4__wrap__img">
                <div class="screen4__wrap__img__bg-1"></div>
                 
                <div class="screen4__wrap__img__bg-2"></div>
                
                <div class="screen4__wrap__img__bg-3"></div>
                
                <div class="screen4__wrap__img__bg-4"></div>
 
                <h4 class="screen4__wrap__img__bg-1__inner-1">实战课程集成开发环境</h4>
                <h4 class="screen4__wrap__img__bg-2__inner-2">内置终端命令行</h4>   
                <h4 class="screen4__wrap__img__bg-3__inner-3">编译你的应用程序</h4> 
                <h4 class="screen4__wrap__img__bg-4__inner-4">通过云端服务输出效果</h4>
            </div>
             
        </div>
    </div>
    <!-- 屏幕5 -->
    <div class="screen5">
        <div class="screen__wrap">
            <div class="screen5__wrap__img__bg-1"></div>
            <h2 class="screen5__wrap__heading">云端学习可以这样简单</h2>
            <div class="screen5__wrap__heading__line"></div>
            <h3 class="screen5__wrap__subheading">看视频，敲代码一气呵成。结合慕课网为你提供的云端学习工具，所见即所得。从此学习不一样</h3>
        </div>
    </div>
    <!-- 屏幕6 -->
    <div class="screen6">
         
 
    <a href="javascript:;" class="screen6__bottom">继续了解学习体验</a>
            </div>
    </div>
 
    <!-- 页脚 -->
<footer>
     
    <div class="screen__wrap">
        <div class="footer__heading">
        <a href="javascript:;">首页网站</a>
        <a href="javascript:;">人才招聘</a>
        <a href="javascript:;">联系我们</a>
        <a href="javascript:;">高校联盟</a>
        <a href="javascript:;">关于我们</a>
        <a href="javascript:;">讲师招募</a>
        <a href="javascript:;">意见反馈</a>
        <a href="javascript:;">友情链接</a>
        </div>
        <div class="footer__subheading">
            <p>copyright &copy;2015 imooc.com All Rights Reserved | 京ICP备 13046642号-2</p>
        </div>
    </div>
</footer>
 
<div class="outline">
    <a href="javascript:;" class="outline__item">实</a>
    <a href="javascript:;" class="outline__item">商</a>
    <a href="javascript:;" class="outline__item">课</a>
    <a href="javascript:;" class="outline__item">集</a>
    <a href="javascript:;" class="outline__item">云</a>
</div>
    <script src="./JS/index.js"></script>
    
</body>
</html>

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/* 头部 */
.header{
 position: relative;
 height:60px;
 width: 100%;
 position: fixed;
 top: 0;
 left: 0;
 z-index: 999;
  
}
 
/* 头部logo */
.header__logo{
    height: 40px;
    background-color:rgba(128,128,128, 0.1);
    font-size: 18px;
    background: url(../img/logo.png)no-repeat;
    font-weight: bold;
    color: white;
    z-index: 99;
    text-indent: 60px;
    line-height: 40px;
    float: left;
    margin-left:10px;
    margin-top: 10px;    
}
 
/* 网页内容容器 */
.screen__wrap{
    width: 1200px;
    height: 640px;
    margin: 0 auto;
 
}
 
/* 头部导航 */
.header__nava{
    position: absolute;
    right: 30px;
    display: block;
    line-height: 60px;
    height: 60px;
}
 
/* 头部导航项 */
.header__nava-item{
    color: #ffffff;
    margin-right: 40px;
    cursor:pointer;
    width: 48px;
    height:12px;
    position: relative;
}
 
 
 
/* 头部导航按钮 */
.header__nava-item_custom_buttom{
    border-radius: 5px;
    height:40px;
    width: 96px;
    background-color: #f01400;
    color: #efefff;
    display: block;
    float:right;
    margin-top: 10px;
    line-height: 40px;
    margin-right: 30px;
    text-align: center;
     
}
 
.header__nava-item_custom_buttom:hover{
    background-color: rgb(184, 23, 23);
}
 
/* 屏幕1 */
.screen1{
    height: 640px;
    width: 100%;
    background:url(../img/sc1.jpg)no-repeat;
    background-size: cover;
    display: block;
    position: relative;
}
/* 屏幕1标题1 */
.screen1__heading{
    position: absolute;
    font-size:40px;
    font-weight: bold;
    color:#ffff;
   display: block;
    padding-top:240px;
    text-align: center;
    float: left;
    width: 100%;
     
}
/* 屏幕1标题2 */
.screen1__subheading{
    position: absolute;
    color:#ffff;
   display: block;
    padding-top:315px;
    text-align: center;
    float: left;
    width: 100%;
     
}
 
/* 屏幕2 */
.screen2{
    width: 100%;
    height:640px;
    height: 640px;
    width: 100%;
    background-size: cover;
    display: block;
    position: relative;
    overflow: hidden;
     
}
/* 屏幕2标题1 */
.screen2__wrap__heading{
    color:#07111b;
    font-size: 40px;
    text-align: center;
    margin: 0;
    line-height: 40px;
    padding-top: 90px;
 
}
 
.screen2__wrap__heading__line{
    border-bottom: #ff0000 2px solid;
    width: 50px;
    text-align: center;
    margin-top: 30px;
    margin:  auto;
    margin-top: 37px;
}
 
/* 屏幕2标题2 */
.screen2__wrap__subheading{
    line-height: 16px;
    color:#07111b;
    font-size: 16px;
    text-align: center;
    margin: 0;
    line-height: 28px;
    padding-top: 24px;
}
/* 屏幕2 图片项  */
.screen2__warp__img-item{
    width: 100%;
    height:391px;
    display: block;
    float: left;
    overflow: hidden;
    margin: 0 auto;
}
 
/* 屏幕2 图片项1 */
.screen2__wrap__img-item__bg-1{
    display: block;
    position: absolute;
    float: left;
    background: url(../img/sc2.png)no-repeat;
    height: 361px;
    width: 750px;
    z-index: 1;
    color:red;
    margin-left: 225px;
    margin-top: 35px;
}
 
/* 屏幕2 图片项2 */
.screen2__wrap__img-item__bg-2{
    display: block;
    position: absolute;
    float: left;
    background: url(../img/sc2-1.png)no-repeat;
    height: 380px;
    width: 275px;
    z-index: 99;
    margin-left: 462.5px;
    margin-top: 20px;
}
 
/* 屏幕2 图片项3 */
.screen2__wrap__img-item__bg-3{
    display: block;
    position: absolute;
    float: left;
    background: url(../img/sc2-2.png)no-repeat;
    height: 305px;
    width: 266px;
    margin-left: 580px;
    margin-top: 103px;
    z-index: 3;
     
}
 
 
/* 屏幕3 */
.screen3{
    float: left;
    width: 100%;
    height:640px;
    height: 640px;
    width: 100%;
    background-size: cover;
    display: block;
    background-color:#2b333b;
    overflow: hidden;
     
}
/* 屏幕3图片 */
.screen3__img__bg-1{
    display: block;
    float: left;
    background: url(../img/sc3.png)no-repeat;
    height: 340px;
    width: 308px;
    margin-left: -80px;
    margin-top: 150px;
    z-index: 1;
     
     
}
/* 屏幕3标题1 */
.screen3__heding{
     
    font-size:35px;
    color: #ffff;
    padding-left: 665px;
    padding-top:230px;
}
.screen3__heading__line{
    border-bottom: #ff0000 2px solid;
    width: 50px;
    margin-left: 665px;
    margin-top: 30px;
}
/* 屏幕3标题2 */
.screen3__subheding{
    font-size:15px;
    color: #ffff;
    margin-left: 665px;
    line-height: 25px;
    padding-top:20px;
}
 
.screen3__inner{
    
    margin-left: 677px;
    display: block;
}
 
.screen3__inner-1{
    float: left;
    width: 65px;
    height: 65px;
    border: #1f5975 4px solid;
    border-radius: 50%;
    color:#2294ff;
    text-align: center;
    line-height: 65px;
    margin-top: 140px;
    margin-right:35px;
}
 
.screen3__inner-2{
    float: left;
    width: 65px;
    height: 65px;
    border: #424d76 4px solid;
    border-radius: 50%;
    color:#7888fd;
    text-align: center;
    line-height: 65px;
    margin-top: 140px;
    margin-right:35px;
}
 
.screen3__inner-3{
    float: left;
    width: 65px;
    height: 65px;
    border: #6b4146 4px solid;
    border-radius: 50%;
    color:#dd413b;
    text-align: center;
    line-height: 65px;
    margin-top: 140px;
    margin-right:35px;
}
 
.screen3__inner-4{
    float: left;
    width: 65px;
    height: 65px;
    border: #29535f 4px solid;
    border-radius: 50%;
    color:#27bde5;
    text-align: center;
    line-height: 65px;
    margin-top: 140px;
    margin-right:35px;
}
 
.screen3__inner-5{
    float: left;
    width: 65px;
    height: 65px;
    border: #3e4e40 4px solid;
    border-radius: 50%;
    color:#909e41;
    text-align: center;
    line-height: 65px;
    margin-top: 140px;
}
 
/* 屏幕4 */
.screen4{
    float: left;
    width: 100%;
    height:640px;
    height: 640px;
    width: 100%;
    background-size: cover;
    display: block;
    position: relative;
    background-color:#f3f5f7;
    overflow: hidden;
}
 
.screen4__wrap__heading{
    color: #07111b;
    font-size: 40px;
    text-align: center;
    padding-top:90px;
}
 
.screen4__wrap__heading__line{
    border-bottom: #ff0000 4px solid;
    width: 50px;
    padding-top: 37px;
    text-align: center;
    margin: 0 auto;
}
 
.screen4__wrap__subheading{
    color: #07111b;
    font-size: 16px;
    text-align: center;
    padding-top:63px;
     
}
 
.screen4__wrap__img{
    display: block;
    height:100%;
    width: 100%;
    margin: 0 auto;
 
}
 
 
.screen4__wrap__img__bg-1{
    background: url(../img/sc4-1.png)no-repeat;
    margin-top: 80px;
    margin-left: 100px;
    margin-right: 220px;
    width: 80px;
    height: 70px;
    display: block;
    float: left;
}
 
.screen4__wrap__img__bg-2{
    background: url(../img/sc4-2.png)no-repeat;
    margin-right: 220px;
    margin-top: 80px;
    width: 80px;
    height:75px;
    display: block;
    float: left;
}
 
.screen4__wrap__img__bg-3{
    background: url(../img/sc4-3.png)no-repeat;
    margin-right: 220px;
    margin-top: 80px;
    width: 80px;
    height:75px;
    display: block;
    float: left;
}
 
.screen4__wrap__img__bg-4{
    background: url(../img/sc4-4.png)no-repeat;
    margin-top: 80px;
    width: 80px;
    height:80px;
    display: block;
    float: left;
}
 
.screen4__wrap__img__bg-1__inner-1{
    height: 16px;
    margin-top: 30px;
    padding-left:60px;
    font-size: 16px;
    line-height: 16px;
    float: left;
    color: #07111b;
}
 
.screen4__wrap__img__bg-2__inner-2{
    height: 16px;
    margin-top: 30px;
    padding-left:160px;
    font-size: 16px;
    line-height: 16px;
    float: left;
    color: #07111b;
     
}
 
.screen4__wrap__img__bg-3__inner-3{
    height: 16px;
    margin-top: 30px;
    padding-left:180px;
    font-size: 16px;
    line-height: 16px;
    float: left;
    color: #07111b;
     
}
 
.screen4__wrap__img__bg-4__inner-4{
    height: 16px;
    margin-top: 30px;
    padding-left:160px;
    font-size: 16px;
    line-height: 16px;
    float: left;
    color: #07111b;
     
}
 
/* 屏幕5 */
.screen5{
    position: absolute;
    float: left;
    width: 100%;
    height:640px;
    height: 640px;
    width: 100%;
    display: block;
    position: relative;
    background: url(../img/sc5.jpg)no-repeat;
    background-size: cover;
    overflow: hidden;
}
 
.screen5__wrap__img__bg-1{
    background: url(../img/sc5-1.png)no-repeat;
    width: 200px;
    height: 200px;
    margin-left: 496px;
    margin-top: 100px;
}
 
.screen5__wrap__heading{
    color: #ffffff;
    font-size: 40px;
    text-align: center;
    padding-top:90px;
}
 
.screen5__wrap__heading__line{
    border-bottom: #ffffff 4px solid;
    width: 50px;
    padding-top: 30px;
    text-align: center;
    margin: 0 auto;
}
 
.screen5__wrap__subheading{
    color: #ffffff;
    font-size: 16px;
    text-align: center;
    padding-top:30px;
}
 
 
.screen6__bottom{
    width: 240px;
    height: 60px;
    border: #707070 1px solid;
    border-radius: 5px;
    margin: 0 auto;
    margin-top: 70px;
    text-align: center;
    line-height: 60px;
    font-weight: bold;
    color:#14191e;
    display: block;
}
 
.screen6__bottom:hover{
    color: #ff0000;
}
 
/* 屏幕6 */
.screen6{
    position: absolute;
    float: left;
    width: 100%;
    height:200px;
    width: 100%;
    background-size: cover;
    display: block;
    position: relative;
    background-color:#ffff;
    overflow: hidden;
}
 
/* 页脚 */
footer{
    float: left;
    height: 105px;
    width: 100%;
    background-color:#000000;
    overflow: hidden;
    position: relative;
    overflow: hidden;
}
footer a{
    margin-right: 40px;
    color: #ffffff;
     
}
 
 
.footer__heading{
    margin-top: 33px;
    width: 100%;
    height:15px;
    text-align: center;
}
 
.footer__subheading{
    padding-top: 13px;
    height:20px;
    margin:0 auto;
    text-align: center;
}
.footer__subheading p{
    font-size: 12px;
    color: #ffffff;
    text-align: center;
}
 
 
.outline{
    position: fixed;
    bottom: 120px;
    right: 0;
    box-shadow: 0px 4px 12px 0px rgba(7, 17, 27, 0.1);
    border-radius: 5px;
}
 
.outline__item{
    display: block;
    width: 40px;
    height: 30px;
    color: #93999f;
    text-align: center;
    line-height: 30px;
    border-top: 1px solid #eee;
    background-color: #ffffff;
     
}
 
 
 
.outline__item:first-child{
     
     border:none;
    border-radius:5px 0 0 0;
}
 
.outline__item:last-child{
 
   border-radius:0 0 0 5px;
}
 
 
.outline__item:hover,.outline__item__ative{
    color: #ff0000;
}

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/* 屏幕1动画 */
.header_status_bgcolor{
    background-color:rgba(49, 54, 58, 0.7);
    transition: all 2s;
     
}
 
.header__nava-item:hover{
    color: #ff0000;
}
 
/* 导航条inner激活 */
.header__nava-item_custom_ative{
    margin-top: 14px;
    padding-bottom: 14px;
    color: #ff0000;
}
 
 
.header__nav-tip{
    position: absolute;
    width: 48px;
    height:2px;
    background-color: #ff0000;
    left: 0px;
    bottom:7px;
    transition: all 1s;
     
    
}
 
.screen1__heading{
    transition: all .8s;
}
 
.screen1__subheading{
    transition: all 1.1s;
}
 
.screen1__heading_animate_init,
.screen1__subheading_animate_init{
    transform: translate(0,100%);
    opacity: 0;
}
 
.screen1__heading_animate_done,
.screen1__subheading_animate_done{
    transform: translate(0,0);
    opacity: 1;
}
 
/* 屏幕2动画 */
.screen2__wrap__img-item__bg-3{
    transition: all 1s .6s;
}
 
.screen2__wrap__heading__line{
    transition: all 1s .5s;
}
 
.screen2__wrap__heading,
.screen2__wrap__subheading,
.screen2__wrap__img-item__bg-2{
    transition: all 1s;
}
 
.screen2__wrap__heading_animate_init,
.screen2__wrap__heading__line_animate_init,
.screen2__wrap__subheading_animate_init,
.screen2__wrap__img-item__bg-2_animate_init{
    transform: translate(0,100%);
    opacity: 0;
}
 
.screen2__wrap__img-item__bg-3_animate_init{
    transform: translate(-100%,100%);
    opacity: 0;
}
 
.screen2__wrap__heading_animate_done,
.screen2__wrap__heading__line_animate_done,
.screen2__wrap__subheading_animate_done,
.screen2__wrap__img-item__bg-2_animate_done,
.screen2__wrap__img-item__bg-3_animate_done{
    transform: translate(0,0);
    opacity: 1;
}
 
/* 屏幕3动画 */
 
.screen3__img__bg-1{
    transition: all .9s ;
}
 
.screen3__heding{
     
    transition: all .7s;
}
 
.screen3__inner{
    transition: all .4s .3s ease-in;
}
 
.screen3__subheding{
    transition: all .7s .2s;
}
 
.screen3__heading__line{
    transition: all 1s .2s;
}
 
.screen3__img__bg-1_animate_init{
  
    transform: translate(0,40%) scale(0.2);
    opacity: 0;
}
 
 
.screen3__heding_animate_init,
.screen3__heading__line_animate_init{
  
    transform: translate(0,40%);
    opacity: 0;
}
 
 
.screen3__inner_animate_init{
     
    transform: translate(0,100px);
    opacity: 0;
}
 
.screen3__subheding_animate_init{
    transform: translate(0,100%);
    opacity: 0;
}
 
.screen3__img__bg-1_animate_done{
    transform: translate(0,0) scale(1.7);
    opacity: 1;
}
 
.screen3__heding_animate_done,
.screen3__heading__line_animate_done,
.screen3__subheding_animate_done,
.screen3__inner_animate_done{
    transform: translate(0,0);
    opacity: 1;
}
 
 
/* 屏幕3弹跳效果 */
/* .screen3__inner{
     
}
 
.screen3__inner_animate_init{
    transform: translate(0,100px);
    opacity: 0;
}
 
.screen3__inner_animate_done{
    animation: org 1s .5s;
}
 
@keyframes org{
    0%,60%,75%,90%,100%{
        -webkit-transition-timing-function: ;
    }
} */
 
 
 
 
/* 屏幕4动画 */
.screen4__wrap__heading{
    transition: all 1s;
}
 
.screen4__wrap__subheading,
.screen4__wrap__heading__line{
    transition: all 1s .1s;
}
 
.screen4__wrap__heading_animate_init,
.screen4__wrap__subheading_animate_init,
.screen4__wrap__heading__line_animate_init{
    transform: translate(0,100px);
    opacity: 0;
}
 
.screen4__wrap__heading_animate_done,
.screen4__wrap__subheading_animate_done,
.screen4__wrap__heading__line_animate_done{
    transform: translate(0,0);
    opacity: 1;
}
 
.screen4__wrap__img__bg-1,
.screen4__wrap__img__bg-2,
.screen4__wrap__img__bg-3,
.screen4__wrap__img__bg-4{
    transition: all 1s;
}
 
.screen4__wrap__img__bg-1_animate_init,
.screen4__wrap__img__bg-2_animate_init,
.screen4__wrap__img__bg-3_animate_init,
.screen4__wrap__img__bg-4_animate_init{
    transform: scale(0);
    opacity: 0;
}
 
.screen4__wrap__img__bg-1_animate_done,
.screen4__wrap__img__bg-2_animate_done,
.screen4__wrap__img__bg-3_animate_done,
.screen4__wrap__img__bg-4_animate_done{
    transform: scale(1);
    opacity: 1;
}
 
.screen4__wrap__img__bg-1__inner-1,
.screen4__wrap__img__bg-2__inner-2,
.screen4__wrap__img__bg-3__inner-3,
.screen4__wrap__img__bg-4__inner-4{
    transition: all 1.2s .3s;
}
 
.screen4__wrap__img__bg-1__inner-1_animate_init,
.screen4__wrap__img__bg-2__inner-2_animate_init,
.screen4__wrap__img__bg-3__inner-3_animate_init,
.screen4__wrap__img__bg-4__inner-4_animate_init{
    transform: translate(0,100%);
    opacity: 0;
}
 
.screen4__wrap__img__bg-1__inner-1_animate_done,
.screen4__wrap__img__bg-2__inner-2_animate_done,
.screen4__wrap__img__bg-3__inner-3_animate_done,
.screen4__wrap__img__bg-4__inner-4_animate_done{
    transform: translate(0,0);
    opacity: 1;
}
 
 
.screen5__wrap__img__bg-1{
    transition: all 1s ;
}
 
.screen5__wrap__heading{
    transition: all 1.2s;
}
 
.screen5__wrap__heading__line,
.screen5__wrap__subheading{
    transition: all 1.2s .3s;
}
 
.screen5__wrap__heading_animate_init,
.screen5__wrap__heading__line_animate_init,
.screen5__wrap__subheading_animate_init{
    transform: translate(0,100%);
    opacity: 0;
}
 
.screen5__wrap__heading_animate_done,
.screen5__wrap__heading__line_animate_done,
.screen5__wrap__subheading_animate_done{
    transform: translate(0,0);
    opacity: 1;
}
 
.screen5__wrap__img__bg-1{
    transition: all .7s;
}
 
.screen5__wrap__img__bg-1_animate_init{
    transform: scale(0);
    opacity: 0;
}
 
 
.screen5__wrap__img__bg-1_animate_done{
    transform: scale(1);
    opacity: 1;
}
 
.outline{
    transform: translate(100%,0);
    transition: all 1.5s;
    opacity: 0;
     
}
 
.outline_status_done{
    transform: translate(0,0);
    opacity: 1;
     
}
 
 
/* 文字特效图片额外 */
.screen4__wrap__img__bg-1:hover{
    transform: scale(1.3);
    cursor: pointer;
}
.screen4__wrap__img__bg-2:hover{
    transform: scale(1.3);
    cursor: pointer;
}
.screen4__wrap__img__bg-3:hover{
    transform: scale(1.3);
    cursor: pointer;
}
.screen4__wrap__img__bg-4:hover{
    transform: scale(1.3);
    cursor: pointer;
}

*{
    margin:0;
    padding:0;
    font-size:12px;
    font-family: "Microsoft Yahei";
     
     
}
a{
    text-decoration: none;
     
}

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// 获取元素
var getElement =function(selector){
    return document.querySelector(selector);
}
 
// 获取元素素组
var getAllElement =function(selector){
    return document.querySelectorAll(selector);
}
 
// 获取元素样式
var getAttribute =function(element){
    return element.getAttribute('class');
}
 
// 设置元素样式
var setAttribute =function(element,cls){
    return element.setAttribute('class',cls);
}
 
// 添加元素样式
var addcls = function(element,cls){
    var basecls=getAttribute(element);
    if(basecls.indexOf(cls)===-1){
        setAttribute(element,basecls+" "+cls);
    }
    return;
}
 
// 删除元素样式
var delcls= function(element,cls){
    var basecls=getAttribute(element);
     if(basecls.indexOf(cls)>-1){
        setAttribute(element,basecls.split(cls).join(' ').replace(/\s+/g,' '));
     }
     return;
}
 
var screenAnimateElements ={
    '.screen1':[
        '.screen1__heading',
        '.screen1__subheading'
    ],
    '.screen2':[
        '.screen2__wrap__heading',
        '.screen2__wrap__heading__line',
        '.screen2__wrap__subheading',
        '.screen2__wrap__img-item__bg-2',
        '.screen2__wrap__img-item__bg-3'
    ],
    '.screen3':[
        '.screen3__img__bg-1',
        '.screen3__heding',
        '.screen3__heading__line',
        '.screen3__subheding',
        '.screen3__inner'
    ],
    '.screen4':[
        '.screen4__wrap__heading',
        '.screen4__wrap__heading__line',
        '.screen4__wrap__subheading',
        '.screen4__wrap__img__bg-1',
        '.screen4__wrap__img__bg-2',
        '.screen4__wrap__img__bg-3',
        '.screen4__wrap__img__bg-4',
        '.screen4__wrap__img__bg-1__inner-1',
        '.screen4__wrap__img__bg-2__inner-2',
        '.screen4__wrap__img__bg-3__inner-3',
        '.screen4__wrap__img__bg-4__inner-4'
    ],
    '.screen5':[
        '.screen5__wrap__img__bg-1',
        '.screen5__wrap__heading',
        '.screen5__wrap__heading__line',
        '.screen5__wrap__subheading'
    ]
};
 
var setScreenAnimateInit =function(screencls){
    var animateElements=screenAnimateElements[screencls];//获取需要设置动画的元素组
 
    for(var i=0;i<animateElements.length;i++){
        var element = document.querySelector(animateElements[i]);//获取需要设置动画的元素
        var baseCls = element.getAttribute('class');//获取基础样式名称
        element.setAttribute('class',baseCls +' '+animateElements[i].substr(1)+'_animate_init');
    }
}
 
var playScreenAnimateDone =function(screencls){
    var animateElements=screenAnimateElements[screencls];//获取需要设置动画的元素组
    for(var i=0;i<animateElements.length;i++){
        var element = document.querySelector(animateElements[i]);
        var baseCls = element.getAttribute('class');
        element.setAttribute('class',baseCls.replace('_animate_init','_animate_done'));
}
}
 
var navaItems=getAllElement('.header__nava-item');
var outlineItems=getAllElement('.outline__item');
 
var switchNavaItemAtive=function(idx){
   for(var i=0;i<navaItems.length;i++){
    delcls(navaItems[i],'header__nava-item_custom_ative');
   }
   addcls(navaItems[idx],'header__nava-item_custom_ative');
   for(var i=0;i<navaItems.length;i++){
    delcls(outlineItems[i],'outline__item__ative');
   }
   addcls(outlineItems[idx],'outline__item__ative');
}
 
 
 
 
  
 
window.onload=function(){
     
   console.log('onload')
   for(k in screenAnimateElements){
     
        setScreenAnimateInit(k);
   } 
    }                     
    setTimeout(function(){playScreenAnimateDone('.screen1');},100);
 
    switchNavaItemAtive(0);
 
window.onscroll=function(){
    var top=document.body.scrollTop||document.documentElement.scrollTop;
    console.log(top);
     
    if(top>400){
        addcls(getElement('.outline'),'outline_status_done');
         
    }else{
        delcls(getElement('.outline'),'outline_status_done');
    }
 
 
    if(top>500){
        addcls(getElement('.header'),'header_status_bgcolor');
         
    }else{
        delcls(getElement('.header'),'header_status_bgcolor');
    }
 
    if(top>100){
        playScreenAnimateDone('.screen2');
        switchNavaItemAtive(1);
    }else{
        switchNavaItemAtive(0)
    }
         
    if(top>600){
        playScreenAnimateDone('.screen3');
        switchNavaItemAtive(2);
    }
         
    if(top>1201){
        playScreenAnimateDone('.screen4');
        switchNavaItemAtive(3);
    }
         
    if(top>1850){
        playScreenAnimateDone('.screen5');
        switchNavaItemAtive(4);
    }
}
 
 
var navtip=getElement('.header__nav-tip')
var setNavaJump=function(i,lib){
    var item=lib[i];
    item.onclick=function(){
        document.body.scrollTop=i*600;
        document.documentElement.scrollTop=i*600;
    }
}
for(var i=0;i<navaItems.length;i++){
    setNavaJump(i,navaItems);
}
 
for(var i=0;i<outlineItems.length;i++){
    setNavaJump(i,outlineItems);
}
 
 
var setTip=function (lib,idx){
    lib[idx].onmouseover=function(){
        console.log(idx);
        navtip.style.left=(idx*91.7)+'px'
    }
    var ativeTip=0;
    lib[idx].onmouseout=function(){
        console.log(idx);
            for(var i=0;i<lib.length;i++){
                if(getAttribute(lib[i]).indexOf('header__nava-item_custom_ative')>-1){
                    ativeTip=i;
                    break;
           }
        } 
         
        navtip.style.left=(ativeTip*91.7)+'px';
    }
}
 
for(var i=0;i<navaItems.length;i++){
    setTip(navaItems,i);
}

陈立天 2020-02-18

源自：宣传页项目 5-6 作业题

收起

3回答

好帮手慕慕子回答被采纳获得+3积分 2020-02-20 09:48:50

同学你好，对于你的问题解答如下：

如下所示，setTip(nanaItem, i)就是调用函数，里面的参数就是实参
如下，switchNavaItemAtive在调用的时候，传入的数字就是实参呀

同学试着理解下。

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好帮手慕慕子 2020-02-19 09:41:41

同学你好，在switchNavaItemAtive方法中添加设置下划线位置的代码即可，示例：

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提问者陈立天 #1

老师写这个代码写的有点懵圈了，这个idx 形参，在setTip=function (lib,idx)这个函数中，不是只有setTip(navaItems,i);给他穿入了实参吗？那这个var switchNavaItemAtive=function(idx) ；并没有switchNavaItemAtive（）给他传入实参。那这个switchNavaItemAtive=function(idx) ；的idx是怎么给他传入实参的呢？

2020-02-19 20:10:54