基于replaceChild制作简单的吞噬特效

<ul class="list" id="list">  <li class="in">1</li>  <li class="in">2</li>  <li class="in">3</li>  <li class="in">4</li>  <li class="in">5</li>  <li class="in">6</li>    </ul>

.in{  height: 20px;  line-height: 20px;  width: 20px;  background-color: blue;  text-align: center;  color: white;}

<script>var oList = document.getElementById('list');//新增一个li元素var oAdd = document.createElement('li');//设置新增元素的css样式oAdd.className = "in";oAdd.style.cssText = 'background-color:red;border-radius:50%';//1s后oAdd替换第0个lisetTimeout(function(){  oList.replaceChild(oAdd,document.getElementsByTagName('li')[0]);  //1s后执行incrementNumber函数  setTimeout(incrementNumber,1000);  },1000);function incrementNumber(){  //获取oList中第1个li  var oLi1 = document.getElementsByTagName('li')[1];  //若存在则进行替换处理  if(oLi1){     oList.replaceChild(oAdd,oLi1);     setTimeout(incrementNumber,1000);      }}</script>