1
<p id="demo">单击“按钮”获取文档第一个子节点的节点名称。</p>2
<button onclick="myFunction()">点我</button>3
<script>4
function myFunction() {5
var x = document.getElementById("demo");6
x.innerHTML = document.firstChild.nodeName;7
}8
</script>
<p id="demo">单击“按钮”获取文档第一个子节点的节点名称。</p><button onclick="myFunction()">点我</button><script> function myFunction() { var x = document.getElementById("demo"); x.innerHTML = document.firstChild.nodeName; }</script>