<html><head><script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.5.1.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ var x = $("p").get(0); $("div").text(x.nodeName + ": " + x.innerHTML); });});</script></head><body><p>这是一个段落</p><button>获取 p DOM 元素</button><div></div></body></html>