JavaScript – 困难的网页动画

我想为网站创建一个CSS或JS动画.但我不知道如何编写代码.动画很难解释,这就是为什么我创建一个小gif动画以便更好地理解.

//编辑：我的主要问题是从白色到黑色的过渡,我在示例中说明了这一点.有人知道解决方案吗？

这是我没有动画的代码：

/* Responsive Navigation */ 
$(document).ready(function(){
        $('#toggle').on('click',function(e){
            e.preventDefault();
            $('nav ul').slideToggle();
        });
      });
   $(window).on('resize',function () {  
      if (window.matchMedia('(min-width: 860px)').matches) {
              $('nav ul').show();
     }
     else {
        $('nav ul').hide();
    }
 });

/* Allgemeines */

html,body {
    margin: 0px;
    padding: 0px; 
    color: #0a0a0a;
    font-family: 'Open Sans',sans-serif;
    font-size: 14px;
    height: 100%;
}

h1,h2,h3,h4,h5,h6{
    font-family: 'Playfair Display',serif;
    font-weight: 400;
}
h1 {
    font-size: 100px;
    font-size: 7.14rem;
    text-align: center;
    line-height: 1.2;
}
a {
    transition: 0.3s;
}
a:hover {
    color: #717171;
}
a:active {
    font-weight: 700;
}






/* Spezifisch */

.logo {
    float: left;
    padding-top: 6px;
    padding-left: 15px;
}

.logo a{
    text-decoration: none;
    color: #0a0a0a;
    font-size: 22px;
    font-size: 1,57rem;
    font-family: 'Playfair Display',serif;
}
.logo a:hover {
    color: #717171;
}
#toggle {
    display: none;
}
nav ul {
    float: right;
    margin-top: 11px;
    padding-right: 20px;
}
nav ul li {
    float: left;
    display: inline;

    padding-right: 20px;
}
nav ul li a{
    color: #0a0a0a;
    text-decoration: none;
}

header {
    clear: both;    
    width: 100%;
    height: 90%;
    position: relative;


}
header h1 {
    color: white;
    text-shadow: 4px 4px 10px rgba(0,0.3);

    position: relative;
    top: 40%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

.darken {
    width: 100%;
    height: 100%;
    position: absolute;
    background: rgba(10,10,0.1);
}


/* Breakpoints */

@media screen and (max-width: 860px){
    .logo {

       width: 100%;
       padding: 6px 0 7px 0px;
    }
    .logotext {
        margin-left: 15px;
    }
    #toggle {
        display: inline;
        float: right;
        padding-right: 15px;
    }
    nav ul{
        width: 100%;
        padding: 0;
        display: none;
    }
    nav ul li {
        width: 100%;
        text-align: center;
        padding: 0;
    }
    nav ul li a {
        display: block;       
        padding: 20px 0 20px 0;
    }
}
@media screen and (max-width: 1100px){
    h1 {
        font-size: 84px;
        font-size: 6rem;
    }
}
@media screen and (max-width: 830px){
    h1 {
        font-size: 70px;
        font-size: 5rem;
    }
}
@media screen and (max-width: 650px){
    h1 {
        font-size: 56px;
        font-size: 4rem;
    }
}
@media screen and (max-width: 550px){
    h1 {
        font-size: 42px;
        font-size: 3rem;
    }
}
@media screen and (max-width: 400px){
    h1 {
        font-size: 28px;
        font-size: 2rem;
    }
}

Meta charset="UTF-8">
    <Meta name="viewport" content="width=device-width,initial-scale=1">

    logo">
        logotext"> Von der Berkelaue


//编辑Nr.2：
现在我有一个适用于示例页面的解决方案.现在我必须尝试在我的页面上工作.
.first,.second {
  position: absolute;
  left: 25%;
  top: 40%;
  
  text-align: center;
  display: block;
  
  overflow: hidden;
  color: red;
  }

.second {
  color:black;
  max-height:60px;
  }

有没有人知道如何创建一个有效的动画？
谢谢,Jannis


最佳答案
你应该能够达到你的目的只是使用的效果：
> 3 CSS3过渡;和
>几行javascript(控制何时激活转换)
见下面的例子：

function startAnimation() {
var frame = document.getElementsByClassName('frame')[0];
var image = frame.getElementsByClassName('image')[0];
var paragraph = image.getElementsByTagName('p')[0];

var newParagraph = paragraph.cloneNode(true);
document.body.appendChild(newParagraph);
frame.insertBefore(newParagraph,image);

setTimeout(function(){
image.classList.add('animated');
paragraph.classList.add('animated');

setTimeout(function(){
newParagraph.classList.add('animated');
},2400);


},1000);

}

window.addEventListener('load',startAnimation,false);
body {
margin: 0;
padding: 0;
background-color: rgb(0,0);	
}

.frame {
position: relative;
width: 700px;
height: 100vh;
margin: 0 auto;
background-color: rgb(255,255,255);
}

.image {
position: absolute;
top: 0;
width: 700px;
height: 364px;
background: url('http://i.imgur.com/hdCeKIz.gif');
overflow: hidden;
transition: all 4s ease-in-out;
}

.frame p {
position: absolute;
top: 94px;
width: 700px;
text-align: center;
font-size: 40px;
color: rgb(0,0);
transition: all 2s ease-in-out;
}

.image p {
color: rgb(255,255);
transition: all 4s ease-in-out;
}

.image.animated {
transform: translate(0,-365px);
}

.frame p.animated {
transform: translate(0,-125px);
}

.image p.animated {
transform: translate(0,365px);
}


 原文链接：https://www.f2er.com/js/425456.html

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