为首屏增加加载动画
为了缓解用户第一次访问时，加载 JS 过大所导致用户等待白屏时间过长导致的用户体验不好，进行的一个优化动效。
实现方案
-
将 动画加载 dom 元素放在 #app 内，Vue 生命周期开始时，会自动清掉 #app 下的所有元素。
示例代码如下：
<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="icon" href="<%= BASE_URL %>logo.png">
<title>Ant Design Pro</title>
<style>.first-loading-wrp{display:flex;justify-content:center;align-items:center;flex-direction:column;min-height:420px;height:100%}.first-loading-wrp>h1{font-size:128px}.first-loading-wrp .loading-wrp{padding:98px;display:flex;justify-content:center;align-items:center}.dot{animation:antRotate 1.2s infinite linear;transform:rotate(45deg);position:relative;display:inline-block;font-size:32px;width:32px;height:32px;box-sizing:border-box}.dot i{width:14px;height:14px;position:absolute;display:block;background-color:#1890ff;border-radius:100%;transform:scale(.75);transform-origin:50% 50%;opacity:.3;animation:antSpinMove 1s infinite linear alternate}.dot i:nth-child(1){top:0;left:0}.dot i:nth-child(2){top:0;right:0;-webkit-animation-delay:.4s;animation-delay:.4s}.dot i:nth-child(3){right:0;bottom:0;-webkit-animation-delay:.8s;animation-delay:.8s}.dot i:nth-child(4){bottom:0;left:0;-webkit-animation-delay:1.2s;animation-delay:1.2s}@keyframes antRotate{to{-webkit-transform:rotate(405deg);transform:rotate(405deg)}}@-webkit-keyframes antRotate{to{-webkit-transform:rotate(405deg);transform:rotate(405deg)}}@keyframes antSpinMove{to{opacity:1}}@-webkit-keyframes antSpinMove{to{opacity:1}}</style>
<!-- require cdn assets css -->
<% for (var i in htmlWebpackPlugin.options.cdn && htmlWebpackPlugin.options.cdn.css) { %>
<link rel="stylesheet" href="<%= htmlWebpackPlugin.options.cdn.css[i] %>" />
<% } %>
</head>
<body>
<noscript>
<strong>We're sorry but vue-antd-pro doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
</noscript>
<div id="app">
<div class="first-loading-wrp">
<h1>大标题</h1>
<div class="loading-wrp">
<span class="dot dot-spin"><i></i><i></i><i></i><i></i></span>
</div>
<div style="display: flex; justify-content: center; align-items: center;">描述</div>
</div>
</div>
<!-- require cdn assets js -->
<% for (var i in htmlWebpackPlugin.options.cdn && htmlWebpackPlugin.options.cdn.js) { %>
<script type="text/javascript" src="<%= htmlWebpackPlugin.options.cdn.js[i] %>"></script>
<% } %>
<!-- built files will be auto injected -->
</body>
</html>
效果如下：
2. 将 动画加载 dom 元素放在 body 下，Vue 生命周期开始时 App.vue (created, mounted) 调用 @/utils/utll 下的 removeLoadingAnimate(#id, timeout) 则会移除加载动画
最后一步： 将样式插入到 public/index.html 文件的 <head></head> 最好写成内联 <style>动画样式</style>
