How to use HTML5 to achieve the effect of waiting for loading animation

The detailed code is as follows:

<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);}
    }

In fact, what I want to do is to load the progress bar effect, but it is not particularly good. This method of judging pictures always feels relatively low-level.

This is the code, there is a perfect solution.

<script>
    document.onreadystatechange=function(){
      if(document.readyState==&#39;complete&#39;){
         $(&#39;.loading&#39;).fadeOut();
      }
    }
</script>

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