纯css3 animation属性制作正在加载中loading动画效果，动态loading加载中特效。这是一款响应式的loading文字加载动画，适用于手机端网页加载特效。
使用方法：
1、head引入css文件
<link type="text/css" href="css/style.css" rel="stylesheet" />
2、body引入HTML代码
<div id="app">
<div class="text-wrapper">
<div class="text part1">
<div>
<span class="letter"><div class="character">L</div> <span></span></span>
<span class="letter"><div class="character">o</div> <span></span></span>
<span class="letter"><div class="character">a</div> <span></span></span>
<span class="letter"><div class="character">d</div> <span></span></span>
<span class="letter"><div class="character">i</div> <span></span></span>
<span class="letter"><div class="character">n</div> <span></span></span>
<span class="letter"><div class="character">g</div> <span></span></span>
</div>
</div>
<div class="how-to"><span>正在加载中，请您耐心等待...</span></div>
</div>
</div>
