apolluo 2018-09-01
1.在入口文件index.html中加入loading动画:
<!DOCTYPE html>
<html>
 <head>
  <meta charset="utf-8">
  <meta name="renderer" content="webkit|ie-comp|ie-stand">
  <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport">
  <!--浏览器兼容模式用最新的文档渲染模式-->
  <meta http-equiv="X-UA-Compatible" content ="IE=edge"/>
  <title></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 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>2.在app.vue的created方法中:
created() { document.body.removeChild(document.getElementById('Loading'))  
}效果如下:

/*垂直居中,div上边界距离窗口上边的距离为窗口高度的50%,并针对不同浏览器进行兼容。-- 在外层添加一个div,把行内容居中,添加.row .justify-content-center -->