1
<p id="demo">单击按钮显示文档的节点名称</p>2
<button onclick="myFunction()">点我</button>3
<script>4
function myFunction() {5
var x = document.getElementById("demo");6
x.innerHTML = document.documentElement.nodeName;7
}8
</script>
<p id="demo">单击按钮显示文档的节点名称</p><button onclick="myFunction()">点我</button><script> function myFunction() { var x = document.getElementById("demo"); x.innerHTML = document.documentElement.nodeName; }</script>