HTML表格转化为Markdown表格

在指定网站的表格上方添加按钮，点击将表格以Markdown格式复制到剪贴板
目前为 2023-09-17 提交的版本。查看最新版本。
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// ==UserScript==
// @name         HTML表格转化为Markdown表格
// @namespace    http://tampermonkey.net/
// @version      0.6
// @description  在指定网站的表格上方添加按钮，点击将表格以Markdown格式复制到剪贴板
// @author       lsovaber
// @match        https://blog.csdn.net/*
// @match        https://www.cnblogs.com/*
// @match        https://www.runoob.com/*
// @match        https://www.jianshu.com/*
// @match        https://*.zhihu.com/*
// @match        https://www.quanxiaoha.com/*
// @match        https://www.geeksforgeeks.org/*
// @match        https://online.stat.psu.edu/stat800/*
// @match        https://www.javatpoint.com/*
// @match        https://cloud.tencent.com/*
// @match        https://scikit-learn.org/*
// @match        https://www.w3school.com.cn/*
// @match        https://www.w3cschool.cn/*
// @match        http://c.biancheng.net/*
// @match        https://juejin.cn/*
// @grant        GM.setClipboard
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';


    const NL = "\n";

    // 存放Markdown表格
    let processor = document.createElement("processor");
    // 获取<table>
    let table = document.getElementsByTagName("table");

    // 大多数网站块代码在<pre>里
    let pre = document.getElementsByTagName("pre");


    setTimeout(init, 500);

    function convertTableElementToMarkdown(tableEl) {
        const rows = [];
        const trEls = tableEl.getElementsByTagName('tr');
        for (let i = 0; i < trEls.length; i++) {
            const tableRow = trEls[i];
            const markdownRow = convertTableRowElementToMarkdown(tableRow, i);
            rows.push(markdownRow);
        }
        return rows.join(NL);
    }

    function convertTableRowElementToMarkdown(tableRowEl, rowNumber) {
        const cells = [];
        const cellEls = tableRowEl.children;
        for (let i = 0; i < cellEls.length; i++) {
            const cell = cellEls[i];
            cells.push(cell.innerText + ' |');
        }
        let row = '| ' + cells.join(" ");

        if (rowNumber === 0) {
            row = row + NL + createMarkdownDividerRow(cellEls.length);
        }

        return row;
    }

    function createMarkdownDividerRow(cellCount) {
        const dividerCells = [];
        for (let i = 0; i < cellCount; i++) {
            dividerCells.push('---' + ' |');
        }
        return '| ' + dividerCells.join(" ");
    }


    function convertTable(x) {
        const content = "<table>" + x.innerHTML + "</table>";
        processor.innerHTML = content.replace(/\s+/g, ' ');

        const tables = processor.getElementsByTagName('table');
        let markdownResults = '';
        if (tables) {
            for (let e of tables) {
                const markdownTable = convertTableElementToMarkdown(e);
                markdownResults += markdownTable + NL + NL;
            }
            let p = document.createElement("p");
            p.innerHTML = "复制成功";
            GM.setClipboard(markdownResults);
            x.parentNode.insertBefore(p, x);
        } else {
            console.log('No table found');
        }
    }

    function copyCode(x) {
        let text;
        if (window.location.href.indexOf("juejin") !== -1) {
            text = x.innerText.replace(/(javascript)|(复制代码)/g, "");
        } else {
            text = x.innerText;
        }
        GM.setClipboard(text);
    }

    function createButtons(x, type) {
        for (let i = 0; i < x.length; i++) {
            let button = document.createElement("button");
            button.innerText = `Copy ${type}`;
            button.style.zIndex = '999';

            // 点击按钮，进行转化
            button.addEventListener('click', function () {
                if (type === "Table") {
                    convertTable(x[i])
                } else {
                    copyCode(x[i]);
                }
            })
            x[i].parentNode.insertBefore(button, x[i]);
        }
    }

    function init() {
        createButtons(table, "Table");
        createButtons(pre, "Code");

        if (window.location.href.indexOf("runoob") !== -1) {
            // 菜鸟教程的代码块
            let example_code = document.getElementsByClassName("example_code");
            createButtons(example_code, "Code");
        } else if (window.location.href.indexOf("cnblogs") !== -1) {
            let cn_blogs = document.getElementsByClassName("code");
            createButtons(cn_blogs, "Code");
        }
    }


})();
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