getElementById("content")获取的是<div>的id，能不能换成getElementstagName("div")获取<div>?有点搞不清

<div id="content">

  <h1>html</h1>

  <h1>php</h1>

  <h1>javascript</h1>

  <h1>jquery</h1>

  <h1>java</h1>

</div>

<script type="text/javascript">

function clearText() {

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

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

      content.removeChild(content.childNodes[i]);

  }

}

</script>

<button onclick="clearText()">清除节点内容</button>