▶ Try it live / 在线试玩 — runs entirely in your browser, nothing to install. 完全在浏览器中运行，无需安装。
A small, dependency-free web app for drilling blackjack basic strategy. It deals a starting hand plus a dealer upcard, asks for the correct play (Hit, Stand, Double, Split, or Surrender), grades your answer against an embedded strategy chart, and tracks your accuracy. Vanilla JavaScript, HTML, and CSS — no frameworks, no build step, no network requests.
一个小巧、零依赖的网页应用，用来反复练习 21 点基本策略 (basic strategy)。它会发一手起手牌和一张庄家明牌 (dealer upcard)，问你正确的打法（要牌 Hit、停牌 Stand、加倍 Double、分牌 Split 或投降 Surrender），用内置策略表给你评分并统计正确率。原生 JavaScript、HTML 和 CSS — 无框架、无构建步骤、无网络请求。
Run locally / 本地运行: open index.html in any modern browser, or serve the folder with python -m http.server 8000.
Rule set the strategy tables assume / 策略表所假设的规则集: 4–8 decks, dealer stands on soft 17 (S17), double after split allowed (DAS), late surrender. 4–8 副牌、庄家软 17 停牌 (S17)、允许分牌后加倍 (DAS)、可晚投降。
Disclaimer: a training tool for learning basic strategy, not gambling advice. Basic strategy minimizes the house edge but does not eliminate it. If you gamble, do so legally and responsibly.
免责声明： 这是学习基本策略的训练工具，不是赌博建议。基本策略只能降低庄家优势 (house edge)，无法消除它。如果你要赌博，请在合法的前提下理性对待。
License / 许可证: MIT — see LICENSE.