CSS3生成音频波纹效果加载中动画

#preloader_1{
  position: relative;
  top: 50px;
}

#preloader_1 span{
  display:block;
  bottom:0px;
  width: 9px;
  height: 5px;
  background:#9b59b6;
  position:absolute;
  -webkit-animation: preloader_1 2s infinite ease-in-out;
  -moz-animation: preloader_1 2s infinite ease-in-out;
  -ms-animation: preloader_1 2s infinite ease-in-out;
  animation: preloader_1 2s infinite ease-in-out;
}

#preloader_1 span:nth-child(2){
  left:11px;
  -webkit-animation-delay: .2s;
  -moz-animation-delay: .2s;
  -ms-animation-delay: .2s;
  -o-animation-delay: .2s;
  animation-delay: .2s;
}

#preloader_1 span:nth-child(3){
  left:22px;
  -webkit-animation-delay: .4s;
  -moz-animation-delay: .4s;
  -ms-animation-delay: .4s;
  -o-animation-delay: .4s;
  animation-delay: .4s;
}

#preloader_1 span:nth-child(4){
  left:33px;
  -webkit-animation-delay: .6s;
  -moz-animation-delay: .6s;
  -ms-animation-delay: .6s;
  -o-animation-delay: .6s;
  animation-delay: .6s;
}

#preloader_1 span:nth-child(5){
  left:44px;
  -webkit-animation-delay: .8s;
  -moz-animation-delay: .8s;
  -ms-animation-delay: .8s;
  -o-animation-delay: .8s;
  animation-delay: .8s;
}

@-webkit-keyframes preloader_1 {
    0% {height:5px;-webkit-transform:translateY(0px);background:#9b59b6;}
    25% {height:30px;-webkit-transform:translateY(15px);background:#3498db;}
    50% {height:5px;-webkit-transform:translateY(0px);background:#9b59b6;}
    100% {height:5px;-webkit-transform:translateY(0px);background:#9b59b6;}
}

@-moz-keyframes preloader_1 {
    0% {height:5px;-moz-transform:translateY(0px);background:#9b59b6;}
    25% {height:30px;-moz-transform:translateY(15px);background:#3498db;}
    50% {height:5px;-moz-transform:translateY(0px);background:#9b59b6;}
    100% {height:5px;-moz-transform:translateY(0px);background:#9b59b6;}
}

@-ms-keyframes preloader_1 {
    0% {height:5px;-ms-transform:translateY(0px);background:#9b59b6;}
    25% {height:30px;-ms-transform:translateY(15px);background:#3498db;}
    50% {height:5px;-ms-transform:translateY(0px);background:#9b59b6;}
    100% {height:5px;-ms-transform:translateY(0px);background:#9b59b6;}
}

@keyframes preloader_1{
  0%{height: 5px;transform:translateY(0px);background:#9b59b6;}
  25%{height: 30px;transform:translateY(15px);background:#3498db;}
  50%{height: 5px;transform:translateY(0px);background:#9b59b6;}
  100%{height: 5px;transform:translateY(0px);background:#9b59b6;}
}

<div id="preloader_1">
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>