如何利用HTML5实现等待加载动画的效果

<p class="loading">
 <p>100<span></span></p>
</p>

 *{margin:0;padding:0;}
 .loading{
 height:100%;width:100%;position:fixed;background:rgba(255,255,255,1);
 }
 .loading >p{position:absolute;left:0;right:0;top:0;bottom:0;margin:auto;height:160px;width:160px;text-align: center;line-height:160px;font-size: 30px;color:#f00;}
 .loading p span{position:absolute;display:block;height:140px;width:140px;margin:10px;border-radius:50%;-webkit-box-shadow:0 2px 3px rgba(102,197,37,0.8); animation:loading ease 1s infinite;left:0;top:0;}
 @keyframes loading{
 0%{transform:rotate(0deg)}
 100%{transform:rotate(360deg)}
 }

<p class="loading">
 <p>
 <i></i>
 <i></i>
 <i></i>
 <i></i>
 <i></i>
</p>
</p>

 *{margin:0;padding:0;}
 .loading{
 height:100%;width:100%;position:fixed;background:rgba(255,255,255,0.95);
 }
 .loading >p{position:absolute;left:0;right:0;top:0;bottom:0;margin:auto;height:30px;width:120px;}
 .loading >p i{display: block;float:left;margin:0 5px; width:5px;height:30px;background:#f00;transform:scaleY(0.3);
 animation:loading 1s ease infinite alternate;
 }
.loading >p i:nth-child(2){animation-delay:0.1s;}
.loading >p i:nth-child(3){animation-delay:0.2s;}
.loading >p i:nth-child(4){animation-delay:0.3s;}
.loading >p i:nth-child(5){animation-delay:0.4s;}
 @keyframes loading{
 0,40%,100%{transform:scaleY(0.3);}
 20%{transform:scaleY(1);}
 }

<script>
 document.onreadystatechange=function(){
 if(document.readyState=='complete'){
 $('.loading').fadeOut();
 }
 }
</script>