1、首先登录网页版Steam 账号。 https://store.steampowered.com

 2、点击：账户明细——许可和产品序列号激活—— 右键页面空白（检查元素）——控制台（Console）——右键粘贴——回车。

 3、恭喜：以下代码，请自行添加，谢谢。

 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™ 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™ 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