如何在组件页面添加加载之前的动画是加不了的,因为动画也是基于html,css,所以需要在index.html文件里面添加

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>后台管理系统</title>
    <style type="text/css">
      #Loading {
       top:50%;
       left:50%;
       position: absolute;
       -webkit-transform: translateY(-50%) translateX(-50%);
       transform: translateY(-50%) translateX(-50%);
       z-index:100;
      }
      @-webkit-keyframes ball-beat {
       50% {
        opacity: 0.2;
        -webkit-transform: scale(0.75);
        transform: scale(0.75); }
    
       100% {
        opacity: 1;
        -webkit-transform: scale(1);
        transform: scale(1); } }
    
      @keyframes ball-beat {
       50% {
        opacity: 0.2;
        -webkit-transform: scale(0.75);
        transform: scale(0.75); }
    
       100% {
        opacity: 1;
        -webkit-transform: scale(1);
        transform: scale(1); } }
    
      .ball-beat > div {
       background-color: #279fcf;
       width: 15px;
       height: 15px;
       border-radius: 100% !important;
       margin: 2px;
       -webkit-animation-fill-mode: both;
       animation-fill-mode: both;
       display: inline-block;
       -webkit-animation: ball-beat 0.7s 0s infinite linear;
       animation: ball-beat 0.7s 0s infinite linear; }
      .ball-beat > div:nth-child(2n-1) {
       -webkit-animation-delay: 0.35s !important;
       animation-delay: 0.35s !important; }
     </style>
    
    </head>
    <body>
     <div id="Loading">
      <div id="dong" class="loader-inner ball-beat">
       <div></div>
       <div></div>
       <div></div>
      </div>
     </div>
     <div id="app"></div>
   
    <!-- built files will be auto injected -->
  </body>
</html>
<script>
  window.onload=function(){
  document.getElementById("dong").classList.remove("loader-inner")
  document.getElementById("dong").classList.remove("ball-beat")
}

</script>

 

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