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Bilibili 一键截图

按 S 键一键截图，并保存成 PNG 格式

当前为 2020-10-28 提交的版本，查看 最新版本。

// ==UserScript==
// @name         Bilibili 一键截图
// @description  按 S 键一键截图，并保存成 PNG 格式
// @version      0.1
// @author       Kazurin
// @match        https://www.bilibili.com/video/*
// @match        https://www.bilibili.com/bangumi/play/*
// @grant        none
// @namespace https://greasyfork.org/users/699115
// ==/UserScript==

'use strict';
let video, videoTitle, canvas, ctx, link;

function lazyGetElements() {
    if(!canvas) {
        video = document.querySelector('.bilibili-player-video video');
        videoTitle = document.querySelector('.bilibili-player-video-top-title');
        canvas = document.createElement('canvas');
        ctx = canvas.getContext('2d');
        link = document.createElement('a');
        link.style.display = 'none';
        document.body.appendChild(link);
    }
    return [video, videoTitle, canvas, ctx, link];
}

function getVideoCurrentTime(video) {
    let time = Math.round(video.currentTime);
    let seconds = time % 60;
    let minutes = (time - seconds) / 60;
    return minutes + '-' + (seconds < 10 ? '0' : '') + seconds;
}

function getBangumiTitle() {
    return document.querySelector('.media-title').textContent;
}

function getBangumiEpisode() {
    return document.querySelector('#eplist_module .ep-item.cursor .ep-title').textContent;
}

function downloadScreenshot() {
    let [video, videoTitle, canvas, ctx, link] = lazyGetElements();
    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
    let dataUrl = canvas.toDataURL('image/png');
    link.href = dataUrl;
    if(window.location.href.indexOf('/bangumi/') >= 0) {
        link.download = getBangumiTitle() + ' ' + getBangumiEpisode() + ' ' + getVideoCurrentTime(video) + '.png';
    } else {
        link.download = videoTitle.textContent + ' ' + getVideoCurrentTime(video) + '.png';
    }
    link.click();
}

document.addEventListener('keydown', e => {
    if(e.keyCode == 83) {
        e.preventDefault = true;
        try {
            downloadScreenshot();
        } catch(e) {
            console.error('截图失败');
            console.error(e);
            window.alert('截图失败，请重试。如果此问题反复出现，请在 F12 控制台查看错误消息，并向开发者反馈。');
        }
    }
});