我的代码tampermonkey google chrome

Question

我想添加一个按钮，从文件的原始文件转到Github源页面，这里是代码：

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// ==UserScript==
// @name        From Raw To Github
// @namespace   From Raw To Github
// @description Add a button to go to Github source page from the raw of a file
// @include     https://raw.githubusercontent.com/*
// @version     1
// @grant       none
// ==/UserScript==

var rawURL = window.location.href;
var [_, repo, path] = rawURL.match(/https?:\/\/raw\.githubusercontent\.com\/([^\/]+\/[^\/]+)\/(.+)\/.+/);

var a = document.createElement("a");
a.href = "https://github.com/" + repo + "/tree/" + path;

var button = document.createElement("button");
button.innerHTML = "Go to Github folder";

a.appendChild(button);

document.body.insertBefore(a, document.body.firstChild);

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这是错误：

出了什么问题？