获取 body 元素的节点名 - 在线编辑器

          <p id="demo">单击按钮获取body元素子节点的节点名称。</p>
<button onclick="myFunction()">点我</button>
<script>
  function myFunction() {
    var txt = "";
    var c = document.body.childNodes;
    for (i = 0; i < c.length; i++) {
      txt = txt + c[i].nodeName + "<br>";
    };
    var x = document.getElementById("demo");
    x.innerHTML = txt;
  }
</script>
<p><strong>注意:</strong> 空格元素是文本，文本是节点</p>
        