<div id="content">

  <h3>html</h3>

  <h3>php</h3>

  <h3>javascript</h3>

  <h3>jquery</h3>

  <h3>java</h3>

</div>

<script type="text/javascript">

function clearText() {

  var content=document.getElementById("content");

  for(var i=content.childNodes.length-1;i>=0;i--){

      var childNode = content.childNodes[i];

      content.removeChild(childNode);

    }

}

上面获取<div>这个父节点用getElementById("content")能不能换成getElementsByTagName("div")