老师，为什么我滑动滚动条时，
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <link rel="stylesheet" href="css/css.css"> <link rel="stylesheet" href="css/animate.css"> </head> <body> <header class="header"> <div class="header__logo">H5实战页面</div> <div class="header__nav"> <a href="javascript:;" class="header__nav-item header__nav-item_status_active">实战课程</a> <a href="javascript:;" class="header__nav-item">商业案例</a> <a href="javascript:;" class="header__nav-item">课程体系</a> <a href="javascript:;" class="header__nav-item">集成环境</a> <a href="javascript:;" class="header__nav-item">云端学习</a> <a href="javascript:;" class="header__nav-item header__nav-item_custom_button" id="btn">即课学习</a> <div class="header__nav-tip"></div> </div> </header> <!--第一屏--> <div class="screen-1"> <div class="wrap"> <h2 class="screen-1__heading screen-1__heading_animate_init">实战课程重磅上线</h2> <h3 class="screen-1__subheading screen-1__subheading_animate_init">一键云学习，还在等待什么？</h3> </div> </div> <!--第二屏--> <div class="screen-2"> <div class="wrap"> <h2 class="screen-2__heading">每门课都是真是商业案例</h2> <h3 class="screen-2__subheading">真实案例，真实场景，在实践中实践、操作、调试<br>大牛带你体验BAT真实开发流程，所有开发流程一一为你呈现</h3> <div class="screen-2-pic"></div> <div class="screen-2-pic-1"></div> </div> </div> <!--第三屏--> <div class="screen-3"> <div class="wrap"> <div class="screen-3-pic"></div> <h2 class="screen-3__heading">强大的语言课程体系支持</h2> <h3 class="screen-3__subheading ">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>,让你体验开发全流程</h3> <div class="screen-3-items"> <div class="screen-3-item screen-3-item-html5">HTML5</div> <div class="screen-3-item screen-3-item-PHP">PHP</div> <div class="screen-3-item screen-3-item-JAVA">JAVA</div> <div class="screen-3-item screen-3-item-Python">Python</div> <div class="screen-3-item screen-3-item-Node-js">Node.js</div> </div> </div> </div> <!--第四屏--> <div class="screen-4"> <div class="wrap"> <h2 class="screen-4__heading">省去本地复杂的环境搭建</h2> <h3 class="screen-4__subheading">你可以告别在虚拟机中调试开发了</h3> <div class="screen-4__type"> <div class="screen-4__type__item screen-4__type__item_i_1"> <div class="screen-4__word">实战课程集成开发环境</div> </div> <div class="screen-4__type__item screen-4__type__item_i_2"> <div class="screen-4__word">内置终端命令</div> </div> <div class="screen-4__type__item screen-4__type__item_i_3"> <div class="screen-4__word">编译你的应用程序</div> </div> <div class="screen-4__type__item screen-4__type__item_i_4"> <div class="screen-4__word">通过云端服务输出效果</div> </div> </div> </div> </div> <!--第5屏--> <div class="screen-5"> <div class="wrap"> <h2 class="screen-5__heading">云端学习可以这样简单</h2> <h3 class="screen-5__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 class="screen-5-pic"></div> </div> </div> <!--第6屏--> <div class="screen-6"> <div class="wrap"> <div class="screen-6__button" id="screen-6__button">继续了解学习体验</div> </div> </div> <footer class="footer"> <div class="daohang"> 网站首页 人才招聘 联系我们 高校联盟 关于我们 讲师招募 意见反馈 友情链接</div> <div class="banquan"> Copyrught © 2015 imooc.com All Rights REserved | 京ICP备 13046642号-2</div> </footer> <!--大纲--> <div class="outline"> <a href="javascript:;" class="outline__item outline__item_status_active">实战课程</a> <a href="javascript:;" class="outline__item">商业案例</a> <a href="javascript:;" class="outline__item">课程体系</a> <a href="javascript:;" class="outline__item">集成环境</a> <a href="javascript:;" class="outline__item">云端学习</a> </div> <script src="js/index.js"></script> </body> </html>
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@keyframes pulse{
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transform: scale(0);
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.screen-4__type__item_i_1_animate_done,
.screen-4__type__item_i_2_animate_done,
.screen-4__type__item_i_3_animate_done,
.screen-4__type__item_i_4_animate_done
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transform: scale(1);
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opacity: 1;
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opacity: 0;
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.screen-5__subheading_animate_done{
transform: translate(0,0);
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var baseCls=getCls(element);
setCls(element,baseCls.split(cls).join(" ").replace(/\s+/g," "));
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//第一步 初始化样式
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".screen-1__heading",
".screen-1__subheading",
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".screen-2":[
".screen-2__heading",
".screen-2__subheading",
".screen-2-pic",
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".screen-4__type__item_i_3",
".screen-4__type__item_i_4",
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".screen-5":[
".screen-5__heading",
".screen-5__subheading",
".screen-5-pic",
]
}
function setScreenAnimateInit(screenCls){
var screen=document.querySelector(screenCls);//获取类名为当前屏的元素
var animateElements=screenAnimateElements[screenCls];
for(var i=0;i<animateElements.length;i++){
var element=document.querySelector(animateElements[i]);//获取到数组中的元素
var basCls=element.getAttribute('class');//得到元素的类名
element.setAttribute("class",basCls+" "+animateElements[i].substr(1)+"_animate_init");//重新设置类名
}
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//播放屏内的元素动画
function playScreenAnimateDone(screenCls){
var screen=document.querySelector(screenCls);//获取类名为当前屏的元素
var animateElements=screenAnimateElements[screenCls];
for(var i=0;i<animateElements.length;i++){
var element=document.querySelector(animateElements[i]);
var basCls=element.getAttribute("class");
element.setAttribute("class",basCls+" "+animateElements[i].substr(1)+"_animate_done");//重新设置类名
}
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setScreenAnimateInit(k);
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//第2步，滚动到哪里，就播放动画
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switchNavItemsActive(1);
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playScreenAnimateDone(".screen-3");
switchNavItemsActive(2);
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if(top>640*3-100){
playScreenAnimateDone(".screen-4");
switchNavItemsActive(3);
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playScreenAnimateDone(".screen-5");
switchNavItemsActive(4);
}
}
//第3步：点击跳转导航栏
var index=0;
var navitems=getAllElem(".header__nav-item");
for(var i=0;i<navitems.length;i++){
navitems[i].setAttribute("data-id",i);
navitems[i].onclick=function(){
index=this.getAttribute("data-id");
document.documentElement.scrollTop=index*640;
}
}
//点击跳转，大纲
var outlineitems=getAllElem(".outline__item");
for(var i=0;i<outlineitems.length;i++){
outlineitems[i].setAttribute("data-id",i);
outlineitems[i].onclick=function(){
index=this.getAttribute("data-id");
document.documentElement.scrollTop=index*640;
}
}
//鼠标放在按钮上，按钮的变化
var btn=document.getElementById("btn");
btn.onmousemove=function(){
btn.style.backgroundColor="#c02c1f";
btn.style.color="#fff";
}
btn.addEventListener("mouseout",function(){
btn.style.backgroundColor="#f01400";
})
//导航大纲联动
var switchNavItemsActive=function(idx){
for(var i=0;i<navitems.length;i++){
delCls(navitems[i],"header__nav-item_status_active");
}
addCls(navitems[idx],"header__nav-item_status_active");
for(var m=0;m<outlineitems.length;m++){
delCls(outlineitems[m],"outline__item_status_active");
}
addCls(outlineitems[idx],"outline__item_status_active");
}
//点击立即学习后跳到第一屏
var btn1=document.getElementById("screen-6__button");
btn1.onclick=function(){
document.documentElement.scrollTop=0;
}
//第一屏动画延迟播放
setTimeout(function(){
playScreenAnimateDone(".screen-1");
},200);
//滑动条
var activeIdx=0;
//第4步：滑动门特效
var navTip=getElem(".header__nav-tip");
for(var i=0;i<navitems.length;i++){
navitems[i].setAttribute("data-id",i);
navitems[i].onmouseover=function(){
var index=this.getAttribute("data-id");
navTip.style.left=(index*100)+"px";
}
navitems[i].onmouseout=function(){
var index=this.getAttribute("data-id");
for(var n=0;n<navitems.length;n++){
if(getCls(navitems[n]).indexOf("header__nav-item_status_active")>-1){
activeIdx=n;
break;
}
}
navTip.style.left=(activeIdx*100)+"px";
}
}老师，为什么我滑动滚动条时，导航下面的条不跟着动，还有当我刷新页面但不滑动页面的时候header部分总是1s后才出现。。该怎么改呀
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同学你好，
如果想要只在滚动条开始滚动的时候，执行headerAnimate这个动画， 可以参考如下思路
（1）用一个单独的类设置动画样式
（2）上一条设置的header一开始不显示的样式可以删除了
（3）在滚动条开始滚动的时候， 给头部添加header_active这个类，执行动画效果
第一屏的字会先从上面飞出来， 主要浏览器对transition属性的解析有差异造成的。如果同学想调整这种情况。
建议： 将screen-1__heading设置的过度属性修改为给screen-1__heading_animate_done这个类下添加过渡属性。
如果帮助到了你， 欢迎采纳！
祝学习愉快~~~~
好帮手慕慕子
2019-08-14 17:11:30
同学你好， 因为在滚动过程中， 没有设置导航下划线的left值跟随移动， 建议修改：
关于header这里， 同学的意思是，header一开始现实的， 1s后才消失然后在显示出来吗？如果是这样的话， 那么是因为一开始header是正常现实的， 延迟0.5s之后执行动画headerAnimate，让头部先应隐藏在显示
建议： 可以给header添加初始样式， 不让其显示
然后设置动画保持在结束状态， 让头部显示在页面中
如果不是指这里的话， 建议： 同学可以详细的描述一下，指的是哪里， 再次提问， 我们会继续为你解答的
如果帮助到了你， 欢迎采纳！
祝学习愉快~~~
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