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
当前为 2022-12-10 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         HTML表格转化为Markdown表格
// @namespace    http://tampermonkey.net/
// @version      0.3
// @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       You
// @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        http://c.biancheng.net/*
// @match        https://juejin.cn/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=csdn.net
// @grant        GM.setClipboard
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';


    const NL = "\n";

    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');
        }
    }


    // 存放markdown表格
    let processor = document.createElement("processor");
    // 所有的table
    let x = document.getElementsByTagName("table")

    setTimeout(f1, 500);

    function f1() {

        // 遍历table，添加button
        for (let i = 0; i < x.length; i++) {
            let button = document.createElement("button");
            button.innerText = "Copy";
            button.style.zIndex = '999';
            //console.log(1);

            // 点击按钮，进行转化
            button.addEventListener('click', function () {
                convertTable(x[i])
            })
            x[i].parentNode.insertBefore(button, x[i]);
            console.log(1);
        }
    }


})();
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