<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Document</title></head><body> <p onclick="p();">我是P标签</p> <button onclick="btn();">我是button</button></body><script type="text/javascript"> function p(){ var p = document.getElementsByTagName('p'); console.log(p); p.style.display="none"; } btn=function(){ var btn = document,getElementsByTagName('button'); console.log(btn); btn.style.display="none"; }</script></html>p和btn都找不到。报错：Uncaught ReferenceError: btn is not defined at HTMLButtonElement.onclick萌新实在没有找出问题 才来提问。希望有大佬帮我看一下
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