H5+svg创建项目列表添加删除动画特效

代码片段：

<header>
<input type="text" autofocus placeholder="Enter a task..." id="item">
<div id='animationDiv'>
<button id="add">
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve"><g><path class="fill" d="M16,8c0,0.5-0.5,1-1,1H9v6c0,0.5-0.5,1-1,1s-1-0.5-1-1V9H1C0.5,9,0,8.5,0,8s0.5-1,1-1h6V1c0-0.5,0.5-1,1-1s1,0.5,1,1v6h6C15.5,7,16,7.5,16,8z"></g></svg>
</button>
</div>
</header>

<div class="container">
<ul class="todo" id="todo"></ul>
<hr class = "divider">
<ul class="todo" id="completed"></ul>
</div>