JS脚本自动获取Steam 125款免费游戏

这个脚本还是我在逛B站的时候看到的，因为代码不是很长，我就简单看了一下。大体思路如下：
定义免费游戏ID
排除已经拥有的游戏ID
携带action，sessionid和subid（游戏ID）向接口发送POST请求
使用模态框实时更新游戏获取进度
操作步骤如下图所示：
在“许可和产品序列号激活”页面的Console中输入以下代码并回车执行，耐心等待即可：
(function() {
    if (location.href.match(/^https:\/\/store\.steampowered\.com\/account\/licenses\/?$/) === null) {
        alert('请在Steam帐号明细页面运行这些代码: https://store.steampowered.com/account/licenses/');

        window.location = 'https://store.steampowered.com/account/licenses/';

        return;
    }

    var freePackages = [
    //本体
    21101, //  DiRT Showdown Demo
    21102, //  Rayman Origins Demo
    21103, //  iBomber Defense Pacific  Demo
    21104, //  Men Of War: Assault Squad GOTY Demo
    21105, //  Bang Bang Racing Demo
    21106, //  Sine Mora Demo
    21107, //  Noitu Love 2 Devolution Demo
    21108, //  Waveform Demo
    21109, //  Ridge Racer&#8482; Unbounded Demo
    21110, //  Hegemony Gold: Wars of Ancient Greece
    21111, //  Rocksmith Demo
    21113, //  Binary Domain Demo
    21114, //  Sniper Elite V2 Demo
    21115, //  Blades of Time Demo
    21117, //  A Valley Without Wind Demo
    21118, //  F1 2012 Demo
    21119, //  Magical Diary Demo
    21120, //  The Dream Machine Demo
    21121, //  Hell Yeah! Demo
    21122, //  A Virus Named Tom Demo
    21123, //  Splice Demo
    21124, //  Atooms to Moolecules
    21125, //  BeatBuddy Demo
    21126, //  DIVO
    21127, //  Imagine Earth Demo
    21128, //  MilitAnt
    21129, //  Plutonic Repulse
    21130, //  The White Laboratory Demo
    21131, //  Blackwell's Asylum
    21132, //  Magic 2014 Demo
    21133, //  Sid Meier's Civilization V: Gods & Kings Demo
    21134, //  Gratuitous Tank Battles Demo
    21135, //  Tiny and Big: Grandpa's Leftovers Demo
    21136, //  KungFu Strike Demo
    21137, //  Adventures of Shuggy Demo
    21138, //  E.Y.E: Divine Cybermancy Demo
    21139, //  Orcs Must Die! 2 Demo
    21140, //  The Book of Unwritten Tales Demo
    21141, //  Sleeping Dogs&#8482; Demo
    21142, //  Damage Inc Demo
    21143, //  Gateways Demo
    21144, //  Football Manager 2013 Demo
    21145, //  XCOM: Enemy Unknown Demo
    21146, //  Transcripted Demo
    21147, //  Intrusion 2 Demo
    21148, //  Din's Curse Demo
    21149, //  Democracy 2 Demo
    21150, //  Ys Origin Demo
    21151, //  Ether Vapor Remaster Demo
    39166, //Heroine's Quest: The Herald of Ragnarok
    13261, //RACE 07: Andy Priaulx Crowne Plaza Raceway
    32032, //Portal 2 Sixense Perceptual Pack
    59373, //Penumbra: Necrologue
    33694, //Grimm&Episode 1 - A Boy Learns What Fear Is
    88162, //Romance of the Three Kingdoms Maker
    36561, //Serena
    58514, //Voxelized
    117526, //Amnesia: Final Revelations
    21101, //  DiRT Showdown Demo
    21102, //  Rayman Origins Demo
    21103, //  iBomber Defense Pacific  Demo
    21104, //  Men Of War: Assault Squad GOTY Demo
    21105, //  Bang Bang Racing Demo
    21106, //  Sine Mora Demo
    21107, //  Noitu Love 2 Devolution Demo
    21108, //  Waveform Demo
    21109, //  Ridge Racer&#8482; Unbounded Demo
    21110, //  Hegemony Gold: Wars of Ancient Greece
    21111, //  Rocksmith Demo
    21113, //  Binary Domain Demo
    21114, //  Sniper Elite V2 Demo
    21115, //  Blades of Time Demo
    21117, //  A Valley Without Wind Demo
    21118, //  F1 2012 Demo
    21119, //  Magical Diary Demo
    21120, //  The Dream Machine Demo
    21121, //  Hell Yeah! Demo
    21122, //  A Virus Named Tom Demo
    21123, //  Splice Demo
    21124, //  Atooms to Moolecules
    21125, //  BeatBuddy Demo
    21126, //  DIVO
    21127, //  Imagine Earth Demo
    21128, //  MilitAnt
    21129, //  Plutonic Repulse
    21130, //  The White Laboratory Demo
    21131, //  Blackwell's Asylum
    21132, //  Magic 2014 Demo
    21133, //  Sid Meier's Civilization V: Gods & Kings Demo
    21134, //  Gratuitous Tank Battles Demo
    21135, //  Tiny and Big: Grandpa's Leftovers Demo
    21136, //  KungFu Strike Demo
    21137, //  Adventures of Shuggy Demo
    21138, //  E.Y.E: Divine Cybermancy Demo
    21139, //  Orcs Must Die! 2 Demo
    21140, //  The Book of Unwritten Tales Demo
    21141, //  Sleeping Dogs&#8482; Demo
    21142, //  Damage Inc Demo
    21143, //  Gateways Demo
    21144, //  Football Manager 2013 Demo
    21145, //  XCOM: Enemy Unknown Demo
    21146, //  Transcripted Demo
    21147, //  Intrusion 2 Demo
    21148, //  Din's Curse Demo
    21149, //  Democracy 2 Demo
    21150, //  Ys Origin Demo
    21151, //  Ether Vapor Remaster Demo
    //dlc
    85604, //RTK Maker - Face CG “RTK13” Set / 三国志ツクール顔登録素材 『三國志13』セット+シナリオ
    21478, //Free to Play免费本体
    50861, //Free to Play Soundtrack
    21473, //Prime World免费本体
    31538, //Prime World - Prime Machine
    32287, //Z3TA+ 2 - Polybius 8-bit Game Pack
    38085, //Saints Row IV - Reverse Cosplay Pack
    72261, //The Secret of Tremendous Corporation免费本体
    81026, //The Sources of Tremendous Corporation
    47333, //Aura Kingdom免费本体
    38820, //Aura Kingdom - Winter Gift
    69802, //Fuse免费本体
    60341, //Fuse - Free Brute Character Pack
    21416, //Elsword免费本体
    63207, //Time Tracer's DLC Package
    59253, //Vindictus - New User Package
    //软件&工具
    35063, //Star Swarm Stress Test
    74465, //Arma 3 Samples
    ];

    var ownedPackages = {};

    jQuery('.account_table a').each(function(i, el) {
        var match = el.href.match(/javascript:RemoveFreeLicense\( ([0-9]+), '/);

        if (match !== null) {
            ownedPackages[ + match[1]] = true;
        }
    });

    var i = 0,
    loaded = 0,
    package = 0,
    total = freePackages.length,
    modal = ShowBlockingWaitDialog('努力执行中...', '请耐心等待，如果有错误请无视，请耐心等待脚本加载完毕');

    for (; i < total; i++) {
        package = freePackages[i];

        if (ownedPackages[package]) {
            loaded++;
            continue;
        }

        jQuery.post('//store.steampowered.com/checkout/addfreelicense', {
            action: 'add_to_cart',
            sessionid: g_sessionID,
            subid: package
        }).always(function() {
            loaded++;

            modal.Dismiss();

            if (loaded >= total) {
                location.reload();
            } else {
                modal = ShowBlockingWaitDialog('库存污染中姕巭孬孕孬嫑勥烎', '加载至 <b>' + loaded + '</b>/' + total + '.');
            }
        });
    }
} ());