JavaScript实现仿百度音乐列表全选功能

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{margin:0;padding:0;}
ul{list-style:none;}
#content{width:300px;border:1px solid #ccc;margin:20px auto;}
#content ul{width:300px;}
#content ul li,#content div{width:300px;height:50px;line-height:50px;border-bottom:1px dotted #ccc;text-indent:20px;}
#content ul li:nth-child(odd) {background:#f1f1f1;}
#content ul li.active,#content ul li:hover{background:#99FFCC;}
</style>
<script>
window.onload = function () {
  var oDiv = document.getElementById('content');
  var checkAll = document.getElementById('checkAll');
  var aLi = oDiv.getElementsByTagName('li');
  var aInput = oDiv.getElementsByTagName('input');


  for ( var i = 0; i < aInput.length; i++ ) {
    aInput[i].index = i;
    aInput[i].onclick = function () {
      aLi[this.index].className = this.checked ? 'active' : '';
    }
  }

  checkAll.onclick = function () {
    for ( var i = 0; i < aInput.length; i++ ) {
      if(!aInput[i].checked) aInput[i].checked = true;
      aLi[i].className = 'active';
    }
  }
}
</script>
</head>

<body>
<div id="content">
  <ul>
    <li>
      <input type="checkbox"/>
      <span>私奔</span>
      <span>梁博</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>北京</span>
      <span>杜甫</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>花人</span>
      <span>李白</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>神话</span>
      <span>光良</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>神话</span>
      <span>光良</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>神话</span>
      <span>光良</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>神话</span>
      <span>光良</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>神话</span>
      <span>光良</span>
    </li>
    <li>
      <input type="checkbox"/>
      <span>神话</span>
      <span>光良</span>
    </li>
  </ul>
  <div>
    <input id="checkAll" type="checkbox" />全选
  </div>
</div>
</body>
</html>