页头和第四屏动画有问题

页头和第四屏动画有问题

<!DOCTYPE html>
<html>
<head>
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<title>H5实战</title>
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<header class="header header_animate_init">
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<div class="header_logo">H5实战页面</div>
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<a href="javascript:;" class="header_nav-item header_nav-item_status_active">实战课程</a>
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    </nav>
</div>

</header>
<div class="screen-1">
<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_heading_animate_init">一键云学习,还在等待什么?</h3>
</div>
<div class="screen-2">
    <div class="screen-2_wrap">
<h2 class="screen-2_heading screen-2_heading_animate_init">每门课都是真实商业案例</h2>
<div class="screen-2_tip screen-2_tip_animate_init"></div>
<h3 class="screen-2_subheading screen-2_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</h3>
<div class="screen-2_banner">
<div class="screen-2_banner1"></div>
<div class="screen-2_banner2"></div>
<div class="screen-2_banner3 screen-2_banner3_animate_init"></div>
</div>
    </div>
</div>
<div class="screen-3">
<div class="screen-3_wrap">
<h2 class="screen-3_heading screen-3_heading_animate_init">强大的语言课程体系支持</h2>
<div class="screen-3_tip screen-3_tip_animate_init"></div>
<div class="screen-3_banner screen-3_banner_animate_init"></div>
<h3 class="screen-3_subheading screen-3_subheading_animate_init">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_features">
<div class="screen-3_features_item screen-3_features_item_desc1">HTML5</div>
<div class="screen-3_features_item screen-3_features_item_desc2">PHP</div>
<div class="screen-3_features_item screen-3_features_item_desc3">JAVA</div>
<div class="screen-3_features_item screen-3_features_item_desc4">Python</div>
<div class="screen-3_features_item screen-3_features_item_desc5">Node.js</div>
</div>
</div>

</div>
<div class="screen-4">
<div class="screen-4_wrap">
<h2 class="screen-4_heading screen-4_heading_animate_init">省去本地复杂的环境搭建</h2>
<div class="screen-4_tip screen-4_tip_animate_init"></div>
<h3 class="screen-4_subheading screen-4_subheading_animate_init">你可以告别在虚拟机中调试开发了</h3>
<div class="screen-4_features screen-4_features_animate_init">

<div class="screen-4_features_item screen-4_features_item_desc1">实战课程集成开发环境</div>

<div class="screen-4_features_item screen-4_features_item_desc2">内置终端命令行</div>


<div class="screen-4_features_item screen-4_features_item_desc3">编译你的应用程序</div>

<div class="screen-4_features_item screen-4_features_item_desc4">通过云端服务输出效果</div>
</div>

</div>
</div>
</div>
<div class="screen-5">
<div class="screen-5_bg"></div>
<h2 class="screen-5_heading">云端学习可以这样简单</h2>
<div class="screen-5_tip"></div>
<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>
<div class="screen-other">
<a class="screen-other_button" href="javascript:;">继续了解学习体验</a>
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<script type="text/javascript" src="js/5-6项目.js"></script>
</body>
</html>
/*BEM 设计模式

模块(没有前缀,多个单词用-连接)
元素(元素在模块之后,可以有多个层级,以_连接)
修饰(某元素、或者某模块特别的状态,必须有一个状态名和状态值,使用_链接)
*/

.header{
	background:rgba(0,0,0, 0.05);
	position: fixed;
	top:0;
	width:100%;
	height:60px;
	z-index: 5;
}
.header_wrap{
	width:100%;
	height:60px;
	position: relative;
}
.header_logo{
	width: 150px;
	height: 60px;
	line-height: 60px;
	font-size:14px;
	font-weight: bold;
	color:#ffffff;      
	text-indent: 50px;
	background:url('../img/logo.png') left center no-repeat;
	margin-left: 11px;
	position: absolute;
}
.header_nav{
	position: absolute;
	right:30px;
	height:60px;
	top:50%;
	margin-top:-19px;
	
}
.header_nav-item{
	color:#ffffff;
	font-size:14px;
	display: block; /*a标签是行元素,转块元素可以设置行高*/
	/*width: 56px;*/
	height:38px;
	line-height: 38px;
	text-align: center;
	float: left;
	margin-left:38px;
	position: relative;
}
.header_nav-item:hover{
	color:#f01400;
}
/*.header_nav-item_status_active{
	color:#f01400;
}*/

.header_nav-item_custom_button{
	width:90px;
	background: #f01400;
	border-radius:3px;
	padding:0;
	
}

/*第一屏*/
.screen-1{
	height:640px;
	background:url("../img/sc1.jpg")no-repeat center;
	/*position: relative;*/
	overflow: hidden;
	background-size:cover;
	
}
.screen-1_heading{
	margin:0;
	padding:0;
	font-size:40px;
	color:#ffffff;
	font-weight: bold;
	text-align: center;
	padding-top:240px;
}
.screen-1_subheading{
	font-size:14px;
	font-weight: normal;
	color:#ffffff;
	text-align: center;
	margin-top:33px;
}


/*第二屏*/
.screen-2{
	background-color:#f3f5f7;
	height: 640px;
	position: relative;
	overflow: hidden;
	
}

.screen-2_wrap{
    width:1200px;
    height:640px;
    margin:0 auto; 
    position: relative;
}

.screen-2_heading{
	color:#07111b;
	margin:0;
	padding:0;
	font-size:40px;
	line-height: 40px;
	padding-top:90px;
	text-align: center;
}

.screen-2_tip{
    width:50px;
    border:2px solid #ff0000;
    margin:0 auto;
    margin-top:36px;
}

.screen-2_subheading{
	color:#07111b;
	font-size:14px;
	padding-top:23px;
	line-height: 24px;
	text-align: center;

}
.screen-2_banner{
    position:relative;
    width:750px;
    margin:0 auto;
    
}

.screen-2_banner1{
	width:750px;
    height:361px;
    background:url(../img/sc2.png) center center no-repeat ;
    background-size:contain;
    position:absolute;
    margin-top:40px;
    overflow: hidden;
   
}

.screen-2_banner2{
    height:380px;
    width:275px;
    background:url(../img/sc2-1.png) center center no-repeat ;
    position:absolute;
    margin-left:240px;
    margin-top:20px;
    overflow: hidden;
    z-index:2;
    
}

.screen-2_banner3{
    height:205px;
    width:266px;
    background:url(../img/sc2-2.png) center center no-repeat ;
    position:absolute;
    margin-left:350px;
    margin-top:100px;
    overflow: hidden;
    z-index: 1;
}

/*第三屏*/
.screen-3{
	background-color:#2b333b ;
	height: 640px;
	position: relative;
	overflow: hidden;
	
}
.screen-3_wrap{
    width:1200px;
    height:640px;
    margin:0 auto; 
    position: relative;
}

.screen-3_heading{
    font-size:35px;
    font-weight:bold;
    color:#ffffff;
    margin-left:636px;
    padding-top:228px;
 
}
.screen-3_tip{
    width:50px;
    margin-left:636px;
    border:2px solid #ff0000;
    margin-top:31px;
}
.screen-3_subheading{
    font-size:14px;
    font-weight:normal;
    color:#ffffff;
    text-align:left;
    margin-left:636px;
    margin-top:26px;
    line-height: 24px;
}

.screen-3_banner{
	position:absolute;
    padding-left:129px;
    top:50%;
    margin-top:-170px;
    width:308px;
    height:340px;
    background: url(../img/sc3.png) left center no-repeat;
}
.screen-3_features{
	width:550px;
	height:66px;
	font-size:12px;
	margin-top: 159px;
    position: absolute;
    bottom: 48px;
    margin-left:650px;
}
.screen-3_features_item{
	width: 66px;
	height: 66px;
    float: left;
    line-height: 66px;
    border-radius:50%;
    text-align: center;
    margin-right: 36px;
}
.screen-3_features_item_desc1{
    color:#1f5975;
    border: 4px solid #1f5975;
}
.screen-3_features_item_desc2{
    color:#424d76;
    border: 4px solid #424d76;
}
.screen-3_features_item_desc3{
    color:#6b4146;
    border: 4px solid #6b4146;
}
.screen-3_features_item_desc4{
    color:#29535f;
    border: 4px solid #29535f;
}
.screen-3_features_item_desc5{
    color:#3e4e40;
    border: 4px solid #3e4e40;
}

/*第四屏*/
.screen-4{
	background-color:#f3f5f7;
	height: 640px;
	position: relative;
	overflow: hidden;
	
}
.screen-4_wrap{
    width:1200px;
    height:640px;
    margin:0 auto; 
    position: relative;
}
.screen-4_heading{
    font-size:42px;
    font-weight:bold;
    color:#07111b;
    text-align: center;
    padding-top:90px;
 
}
.screen-4_tip{
    width:50px;
    margin:0 auto;
    border:2px solid #ff0000;
    margin-top:36px;
}

.screen-4_subheading{
    font-size:14px;
    font-weight:normal;
    color:#07111b;
    text-align: center;
    margin-top:24px;
    line-height: 14px;
}
.screen-4_features{
	width: 1060px;
	height:120px;
	margin:75px auto 0;
	font-size:14px;
	color:#07111b;
}
.screen-4_features_item{
	width:165px;
	padding-top: 120px;
	float: left;
	position: relative;
    margin:0 50px;
    text-align: center;
    
}
.screen-4_features_item_desc1{
	background: url(../img/sc4-1.png) no-repeat center center;

}
.screen-4_features_item_desc2{
	background: url(../img/sc4-2.png) no-repeat center center;
}
.screen-4_features_item_desc3{
	background: url(../img/sc4-3.png) no-repeat center center;
}
.screen-4_features_item_desc4{
	background: url(../img/sc4-4.png) no-repeat center center;
}

/*第五屏*/
.screen-5{
    height:640px;
    background:url('../img/sc5.jpg') no-repeat center;
    background-size: cover;
}
.screen-5_bg{
	width:200px;
    height:200px;
    background:url('../img/sc5-1.png') no-repeat center;
    background-size: contain;
    position: absolute;
    left: 50%;
    margin-left:-100px;
    padding-top:100px;
    overflow: hidden;
}
.screen-5_heading{
    font-size:42px;
    font-weight:bold;
    color:#ffffff;
    text-align: center;
    padding-top:360px;
 
}
.screen-5_tip{
    width:50px;
    margin:0 auto;
    border:2px solid #ffffff;
    margin-top:36px;
}

.screen-5_subheading{
    font-size:14px;
    font-weight:normal;
    color:#ffffff;
    text-align: center;
    margin-top:24px;
    line-height: 14px;
}
/*第六屏*/
.screen-other{
	height:200px;
    text-align:center;
    line-height:200px;
    
}
.screen-other_button{
	color:#14191e;
    border:2px solid #707070;
    border-radius:5px;
    font-size: 18px;
    padding:20px 45px; 
    cursor: pointer;
}
/*页脚*/
.footer{
    height:105px;
    background:#000000;
    text-align:center;
    position: relative;
}
.footer-nav_item{
	color:#c8cdd2;
    display: inline-block;
    padding:30px 20px 10px;
 
}
.footer span{
    font-size:14px;
    color:#787d82;
}
.outline{
    position: fixed;
    right:0;
    bottom:150px;
    z-index:3;
    background:#ffffff;
    padding:2px 10px;
    box-shadow: 0px 4px 12px rgba(7, 17, 27, 0.1);
 
}
.outline_item{
    color:#000000;
    display:block;
    padding: 10px;
}
.outline_item_active{
    color:red;
}
/*菜单栏动画*/
.header {
    transition: all 1s;
}
.header_animate_init{
    opacity: 0;
    transform: translate(0,-100%);
}
.header_animate_done{
    opacity: 1;
    transform: translate(0,0);
}


/*第一屏动画*/
.screen-1_heading{
    transition: all 1s ease-in-out .5s;
}
.screen-1_subheading{
    transition: all 1.5s ease-in-out 1s;
}
 
.screen-1_heading_animate_init{
	opacity: 0;
    transform: translate(0,30%);
}
.screen-1_subheading_animate_init{
	opacity: 0;
    transform: translate(0,100%);
}
 
.screen-1_heading_animate_done,
.screen-1_subheading_animate_done{
	opacity: 1;
    transform: translate(0,0);
}

/*第二屏动画*/
.screen-2_heading,
.screen-2_tip
{
    transition: all 1.5s;
}
.screen-2_subheading{
    transition: all 1.5s .5s;
}
.screen-2_banner3{
	transition: all 1s;
}
 
.screen-2_heading_animate_init,
.screen-2_subheading_animate_init,
.screen-2_tip_animate_init
{
	opacity: 0;
    transform: translate(0,100%);
}

 
.screen-2_heading_animate_done,
.screen-2_subheading_animate_done,
.screen-2_tip_animate_done
{
	opacity: 1;
    transform: translate(0,0);
}
/*定义帧动画*/
@-webkit-keyframes shake2{
	0%{
	
		transform: translate(0,10%);
	}
	30%{
		
		transform: translate(0,-10%);
	}
	70%{
		
		transform: translate(0,10%);
	}
	100%{
		
		transform: translate(0,0);
	}
}
.screen-2_banner3{
	-webkit-animation:shake2 1s 1.5s;
}

/*第三屏动画*/
.screen-3_heading,
.screen-3_tip,
.screen-3_features,
.screen-3_banner{
    transition: all 1s;
}
.screen-3_subheading{
	transition: all 1s .5s;
}
.screen-3_heading_animate_init,
.screen-3_tip_animate_init,
.screen-3_subheading_animate_init{
    opacity: 0;
    transform: translate(0,30%);
}
.screen-3_heading_animate_done,
.screen-3_tip_animate_done,
.screen-3_subheading_animate_done{
    opacity: 1;
    transform: translate(0,0);
}
/*添加screen-3_features_banner_animate_init*/
.screen-3_banner_animate_init{
    opacity: 0;
    transform: scale(0.5);
}
/*添加screen-3_features_banner_animate_done*/
.screen-3_banner_animate_done{
    opacity: 1;
    transform: scale(1);
}
.screen-3_features_animate_init{
    opacity: 0;
    transform: translate(0,-100%);
}
.screen-3_features_animate_done{
    opacity: 1;
    transform: translate(0,0);
}

/*定义帧动画*/
@-webkit-keyframes shake3{
	0%{
		opacity: 0;
		transform: translate(0,-10px);
	}
	20%{
		opacity: 0;
		transform: translate(0,0px);
	}
	30%{
		opacity: 0.25;
		transform: translate(0,-20px);
	}
	40%{
		opacity: 0.25;
		transform: translate(0,0px);
	}
	50%{
		opacity: 0.5;
		transform: translate(0,-20px);
		
	}
	60%{
		opacity: 0.5;
		transform: translate(0,0);
		transform:scale(1);
	}
	70%{
		opacity: 0.75;
		transform: translate(0,-25px);
		transform:scale(0.99);
	}
	80%{
		opacity: 0.75;
		transform: translate(0,0px);
		transform:scale(1);
	}
	90%{
		opacity: 0.8;
		transform: translate(0,10px);
		transform:scale(0.98);
	}
	100%{
		opacity: 0.8;
		transform: translate(0,10px);
		transform:scale(1);
	}

}
/*使用帧动画*/
.screen-3_features_item{
	-webkit-animation:shake3 ease-out 2s;
}

/*第四屏动画*/
.screen-4_heading,
.screen-4_tip,
.screen-4_features{
    transition: all 1s;
}
.screen-4_subheading{
	transition: all 1s .5s;
}
.screen-4_heading_animate_init
{
	opacity: 0;
    transform: translate(0,10%);	
}
.screen-4_subheading_animate_init,
.screen-4_tip_animate_init
{
	opacity: 0;
    transform: translate(0,100%);
}
.screen-4_features_animate_init{
	opacity: 0;
    transform:scale3d(0.5,0.5,0.5);
}
.screen-4_heading_animate_done,
.screen-4_tip_animate_done,
.screen-4_subheading_animate_done
{
	opacity: 1;
    transform: translate(0,0);	
}
.screen-4_features_animate_done{
	opacity: 1;
    transform:scale3d(1,1,1);
}
// alert("done");   测试js文件引用进来了
//获取元素
var getElem=function(selector)
{
	return document.querySelector(selector);
}

var getAllElem=function(selector)
{
	return document.querySelectorAll(selector);
}
//获取元素样式
var getCls=function(element)
{
	return element.getAttribute('class');
}

//设置元素样式
var setCls=function(element,cls)
{
	return element.setAttribute('class',cls);
}

//为元素添加样式
var addCls=function(element,cls)
{
	var baseCls=getCls(element);
	if(baseCls.indexOf(cls)===-1)
	{
		setCls(element,baseCls+' '+cls);
	}
}
//为元素删除样式
var delCls=function(element,cls)
{
	var baseCls=getCls(element);
	if(baseCls.indexOf(cls)!=-1){
		setCls(element,baseCls.split(cls).join(' ').replace(/\s+/g,' '));
	}
}

//第一步:初始化样式 init
var screenAnimateElements={
	'.header':[
		".header_logo",
	    ".header_nav",
	],
	'.screen-1':[
		'.screen-1_heading',
		'.screen-1_subheading',
	],
	'.screen-2':[
		'.screen-2_heading',
		'.screen-2_tip',
		'.screen-2_subheading',
		'.screen-2_banner3',
		
	],
	'.screen-3':[
		'.screen-3_heading',
		'.screen-3_subheading',
		'.screen-3_tip',
		'.screen-3_features',
		'.screen-3_banner',
		
	],
	'.screen-4':[
		'.screen-4_heading',
		'.screen-4_subheading',
		'.screen-4_tip',
		'.screen-4_features',
	],
	'.screen-5':[
		'.screen-5_heading',
		'.screen-5_subheading',
		'.screen-5_bg',
	]
};

//设置屏内元素为初始状态
	var setScreenAnimateInit=function(screenCls){
	var screen=document.querySelector(screenCls);//获取当前屏
	var animateElements=screenAnimateElements[screenCls]; //当前屏中需要设置动画的元素
	for(var i=0;i<animateElements.length;i++)
			{
				var element=document.querySelector(animateElements[i]);
				var baseCls=element.getAttribute('class');
				element.setAttribute('class',baseCls+' '+animateElements[i].substr(1)+'_animate_init');                                     
			}
    
}

//设置播放屏内的元素动画
var playScreenAnimateDone=function(screenCls)
{
	var screen=document.querySelector(screenCls);//获取当前屏
	var animateElements=screenAnimateElements[screenCls]; //当前屏中需要设置动画的元素
	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')
					);
			}
	
}
window.onload=function(){
	for(k in screenAnimateElements)
	{
		if(k==='.screen-1')
		{
			continue;
		}
		setScreenAnimateInit(k);
	}
}

//第二步,滚动到哪里,就播放到哪里
var navItems=getAllElem('.header_nav-item');
var outLineItems=getAllElem('.outline_item');
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 i=0;i<outLineItems.length;i++)
	{
		delCls(outLineItems[i],'outline_item_status_active');
	}
	addCls(outLineItems[idx],'outline_item_status_active');
}

switchNavItemsActive(0)
window.onscroll=function()
{
	var top=document.documentElement.scrollTop;
	
	if(top>60)
	{
		addCls(getElem('.header'),'header_status_back');
		addCls(getElem('.outline'),'outline_status_in');

	}
	else{
		delCls(getElem('.header'),'header_status_back');
		delCls(getElem('.outline'),'outline_status_in');
		switchNavItemsActive(0)
	}
	if(top>1)
	{
		playScreenAnimateDone('.screen-1');

	}
	if(top>640*1-200)
	{
		playScreenAnimateDone('.screen-2');
		switchNavItemsActive(1)
	}
	if(top>640*2-100)
	{
		playScreenAnimateDone('.screen-3');
		switchNavItemsActive(2)
	}
	if(top>640*3-100)
	{
		playScreenAnimateDone('.screen-4');
		switchNavItemsActive(3)
	}
	if(top>640*4-100)
	{
		playScreenAnimateDone('.screen-5');
		switchNavItemsActive(4)
	}
	
}

// 第三步双向定位

var setNavJump=function(i,lib)
{
	var item=lib[i];
	item.onclick=function()
	{
		
		document.documentElement.scrollTop=i*800;
	}
}

for(var i=0;i<navItems.length;i++)
{
	setNavJump(i,navItems);
}
for(var i=0;i<outLineItems.length;i++)
{
	setNavJump(i,outLineItems);
}

//第四步 滑动门特效
var navTip=getElem('.header_nav-tip');
var setTip=function(idx,lip)
{
	lip[idx].onmouseover=function()
	{
		navTip.style.left=(idx*70)+'px';
	}
	var activeIdx=0;
	lip[idx].onmouseout=function()
	{
		for(var i=0;i<lib.length;i++)
			if(getCls(lib[i]).indexOf('header_nav-item_status_active'))
				activeIdx=i;
			    break;
	}
}
for(var i=0;i<navItems.length;i++)
{
	setTip(i,navItems);
}

//小优化,默认载入第一屏的动画
setTimeout(function(){playScreenAnimateDone('.screen-1'),200})

页头不出来,第四屏动画四个小图片出来方式跟效果不一样

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2回答

同学你好, 

  1. 因为可以不用写这个样式, 所以推荐删除。你这里通过给screen-4_features_animate_init给四个图片整体设置效果, 这里建议删除了, 使用老师提供的参考方式, 给四个图片单独设置动画效果

  2. 因为老师给同学提供修改建议, 是在同学的代码基础上,为了方便同学理解, 能少改动的就尽量改动少一点。所以通过修改css样式是最简单直接有效的方式实现效果

  3. 中间的空格表示后代选择器,选择screen-4_features_animate_init下的.screen-4_features_item元素

  4. 第三屏动画, 因为动画时间差的问题,导致可能出现同学说的这种情况, 建议:可以参考老师给同学的第四屏四个图片动画的实现的思路, 设置四个小圆的动画。 另, 这个四个小圆需要有呼吸灯的效果, 也就是一直放大缩小的效果哦。 参考如下代码修改:

    http://img1.sycdn.imooc.com//climg/5d639e4e0001d4dd07500740.jpg

如果帮助到了你, 欢迎采纳!

祝学习愉快~~~


好帮手慕慕子 2019-08-26 15:35:51

同学你好, 

  1. 页头由于设置了初始init类,导致没有出现, 建议修改:

    (1)可以不给头部添加init类名

    http://img1.sycdn.imooc.com//climg/5d6383ee0001702f13880480.jpg

    (2)通过设置动画帧实现头部的动画效果

    http://img1.sycdn.imooc.com//climg/5d63849f0001456807280727.jpg

    (3)建议优化: 导航项的下划线需要清除哦

  2. 可以给四个小图片设置缩小到放大的过渡效果

    http://img1.sycdn.imooc.com//climg/5d63880100016b9d08830875.jpg

如果帮助到了你, 欢迎采纳!

祝学习愉快~~~

  • 提问者 慕言_7946275 #1
    为什么要删掉.screen-4_features_animate_init,留下screen-4_features_animate_done 然后.screen-4_features_animate_init .screen-4_features_item 为什么这么写,中间空格隔开什么意思老师,,, 不能在.screen-4_features_item四个图片共同设置个动画吗
    2019-08-26 16:21:13
  • 提问者 慕言_7946275 #2
    老师,第三屏动画四个圆的部分,滚动不播放,刷新才播放什么原因
    2019-08-26 16:41:45
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