CSS实现一个简单loading动画效果

<div id="ddr">
    <div class="ddr ddr1"></div>
    <div class="ddr ddr2"></div>
    <div class="ddr ddr3"></div>
    <div class="ddr ddr4"></div>
    <div class="ddr ddr5"></div>
</div>

#ddr{
    marg: 0 auto;
    width: 70px;
    height: 120px;
}
.ddr{
    width: 10px;
    height: 120px;
    float: left;
    marg: 2px;
    background-color: #00ff00;
    animation: loadg 1s fite ease--out;/animation动画名称 持续时间 动画速度曲线 延迟 执行多少次 是否正反方向轮流播放/
}
.ddr2{
    animation-delay: -0.9s;/定义开始执行的地方，负号表示直接从第900ms开始执行/
}
.ddr3{
    animation-delay: -0.8s;
}
.ddr4{
    animation-delay: -0.7s;
}
.ddr5{
    animation-delay: -0.6s;
}
@keyframes loadg {
    0%,40%,100%{ /定义每帧的动作/
        -webkit-transform: scaleY(0.5);
    }
    20%{
        -webkit-transform: scaleY(1);
    }
}

 <div id="circle"></div>

#circle{
    marg: 20px auto;
    width: 100px;
    height: 100px;
    border: 5px white solid;
    border-left-color: #ff5500;
    border-right-color:#0c80fe;
    border-radius: 100%;
    animation: loadg1 1s fite lear;
}
@keyframes loadg1{
    from{transform: rotate(0deg)}to{transform: rotate(360deg)}
}

 <div id="loader">
     <div id="loader-ner"></div>
 </div>

#loader3{
    box-sizg: border-box;
    position: relative;
    marg-left: 48%;
    transform: rotate(180deg);
    width: 50px;
    height: 50px;
    border: 10px groove rgb(170, 18, 201);
    border-radius: 50%;
    animation: loader-3 1s ease-out alternate fite;/ alternate表示则动画会在奇数次数（1、3、5 等等）正常播放，而在偶数次数（2、4、6 等等）反向播放 /
}
#loader3-ner{
    box-sizg: border-box;
    width: 100%;
    height: 100%;
    border: 0 set rgb(170, 18, 201);
    border-radius: 50%;
    animation: border-zoom 1s ease-out alternate fite;
}
@keyframes loader-3 {
    0%{
        transform: rotate(0deg);
    }
    100%{
        transform: rotate(-360deg);
    }
}
@keyframes border-zoom {
    0%{
        border-width: 0px;
    }
    100%{
        border-width: 10px;
    }
}

 <div id="loadg">
     <div id="loader" class="heart"></div>
 </div>

#loadg4{
    width: 100%;
    height: 100px;
}
#loader4{
    position: relative;
    marg-left: calc(50% - 25px);
    width: 50px;
    height: 50px;
    animation: loader-4 1s ease--out alternate fite;
}
.heart:before{
    position: absolute;
    left: 11px;
    content: "";
    width: 50px;
    height: 80px;
    transform: rotate(45deg);
    background-color: rgb(230, 6, 6);
    border-radius: 50px 50px 0 0;
}
.heart:after{
    position: absolute;
    right: 11px;
    content: "";
    width: 50px;
    height: 80px;
    background-color: rgb(230, 6, 6);
    transform: rotate(-45deg);
    border-radius: 50px 50px 0 0;
}
@keyframes loader-4 {
    0%{
        transform: scale(0.2);
        opacity: 0.5;
    }
    100%{
        transform: scale(1);
        opacity: 1;
    }
}

#picHolder{
  / 图片样式 /
      position: absolute;
      : %;
      left: %;
      width: px;
      height: px;
      marg-left:-px;
      background-image: url("../../../Library_image/tangyuan.png");
     background-repeat: no-repeat;
     background-position-x: ;
     cursor: poter; 
 }

  function animation () {
  / 定时移动图片，使观众看到不同的帧 /
    var po = 
    var i = 
    var holder = document.getElementById('picHolder')
    setInterval(function () {
      po += -
      i++
      holder.style.backgroundPositionX = po + 'px'
     if (i >= ) {
       i = 
       po = 
     }
   }, )
 }
 wdow.onload = function () {
   animation()
 }