Vue防止白屏添加首屏动画

单页应用有个无法避免的问题就是首屏加载慢，虽然可以通过<font color=red>gzip、路由懒加载、CDN、提高服务器带宽</font>等手段，首屏加载速度仍然比传统多页应用慢一些。

为了提高用户体验，首屏添加loading动画很有必要，并且实现特别简单。

vue-cli3生成的项目中，打开index.html会发现如下代码

<body>
  <noscript>
    <strong>We're sorry but doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
  </noscript>
  <div id="app"></div>
  <!-- built files will be auto injected -->

</body>

我们只需要在这个div中插入loading代码即可,vue初始化完成后会自动替换

<div id="app">此处插入loading代码</div>

以下是我实现的一种动画效果，可自行替换

image

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
  <meta http-equiv="X-UA-Compatible" content="chrome=1"/>
  <link rel="icon" href="<%= BASE_URL %>favicon.ico">
  <link rel="stylesheet" type="text/css" href="//at.alicdn.com/t/font_1112431_q8oa3yvrwbh.css">
  <title>demo</title>
  <style>
    .spinner {
      margin: 100px auto;
      width: 50px;
      height: 60px;
      text-align: center;
      font-size: 10px;
    }

    .spinner > div {
      background-color: #FE3C71;
      height: 100%;
      width: 6px;
      display: inline-block;
      -webkit-animation: stretchDelay 1.2s infinite ease-in-out;
      animation: stretchDelay 1.2s infinite ease-in-out;
    }

    .spinner .rect2 {
      -webkit-animation-delay: -1.1s;
      animation-delay: -1.1s;
    }

    .spinner .rect3 {
      -webkit-animation-delay: -1.0s;
      animation-delay: -1.0s;
    }

    .spinner .rect4 {
      -webkit-animation-delay: -0.9s;
      animation-delay: -0.9s;
    }

    .spinner .rect5 {
      -webkit-animation-delay: -0.8s;
      animation-delay: -0.8s;
    }

    @-webkit-keyframes stretchDelay {
      0%, 40%, 100% {
        -webkit-transform: scaleY(0.4)
      }
      20% {
        -webkit-transform: scaleY(1.0)
      }
    }

    @keyframes stretchDelay {
      0%, 40%, 100% {
        transform: scaleY(0.4);
        -webkit-transform: scaleY(0.4);
      }
      20% {
        transform: scaleY(1.0);
        -webkit-transform: scaleY(1.0);
      }
    }
  </style>
</head>
<body>
<noscript>
  <strong>We're sorry but demo doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
</noscript>
<div id="app">
  <div class="spinner">
    <div class="rect1"></div>
    <div class="rect2"></div>
    <div class="rect3"></div>
    <div class="rect4"></div>
    <div class="rect5"></div>
  </div>
</div>
<!-- built files will be auto injected -->
</body>
</html>

Vue防止白屏添加首屏动画

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