适用于阿尔法平台的神秘小代码

使用方法：按F12打开浏览器控制台，把下面的代码全部粘贴到浏览器控制台（Console），回车即可。 温馨提示：这段代码是通过查看答案实现的，会影响不查看答案的正确率。请谨慎使用。

(function () {

    'use strict';

    let running = false;

    const sleep = ms => new Promise(res => setTimeout(res, ms));

    function decodeHTMLEntities(str) {

        return str

            .replace(/&lt;/g, '<')

            .replace(/&gt;/g, '>')

            .replace(/&amp;/g, '&')

            .replace(/&quot;/g, '"')

            .replace(/&#39;/g, "'");

    }

    function hasRunButton() {

        return Array.from(document.querySelectorAll('button')).some(btn =>

            btn.textContent.includes('运行') || btn.textContent.includes('执行')

        );

    }

    function clickButtonByText(text) {

        const btn = Array.from(document.querySelectorAll('button'))

            .find(b => b.textContent.includes(text));

        if (btn) btn.click();

        return !!btn;

    }

    function clickVideoNext() {

        const nodes = Array.from(document.querySelectorAll('span.items-end div'));

        const target = nodes.find(el => el.textContent.includes('下一项'));

        if (target) {

            target.click();

            return true;

        }

        return false;

    }

    function getPreContent() {

        const pre = document.querySelector('pre');

        return pre ? pre.innerText : null;

    }

    function setCodeMirrorValue(code) {

        const editor = document.querySelector('.CodeMirror')?.CodeMirror;

        if (editor) editor.setValue(code);

    }

    async function handleCodeQuestion() {

        clickButtonByText('查看答案');

        await sleep(300);

        let code = getPreContent();

        if (!code) return;

        code = decodeHTMLEntities(code);

        const seen = new Set();

        code = code.split('\n').filter(l => {

            if (seen.has(l)) return false;

            seen.add(l);

            return true;

        }).join('\n');

        setCodeMirrorValue(code);

        await sleep(200);

        clickButtonByText('提交');

        await sleep(1500);

        clickButtonByText('下一项');

        await sleep(800);

    }

    async function handleNonCodeQuestion() {

        if (!clickVideoNext()) {

            clickButtonByText('下一项');

        }

        await sleep(800);

    }

    async function mainLoop() {

        while (running) {

            if (hasRunButton()) {

                await handleCodeQuestion();

            } else {

                await handleNonCodeQuestion();

            }

        }

    }

    const btn = document.createElement('button');

    btn.textContent = '▶ 开始刷题';

    btn.style.position = 'fixed';

    btn.style.top = '1%';

    btn.style.left = '60%';

    btn.style.zIndex = '9999';

    btn.style.background = 'rgba(0,0,0,0.6)';

    btn.style.color = '#fff';

    btn.style.border = 'none';

    btn.style.padding = '8px 16px';

    btn.style.borderRadius = '4px';

    btn.style.cursor = 'pointer';

    btn.onclick = () => {

        running = !running;

        btn.textContent = running ? '⏸ 停止刷题' : '▶ 开始刷题';

        if (running) mainLoop();

    };

    document.body.appendChild(btn);

})();