switch语句中使用逗号连接多个case的写法是否可行？是否存在潜在问题？

Great question! Let's unpack this clearly for you.

First off: that comma-separated case syntax is not a hack—it’s an official part of ECMAScript 2022 (ES13), introduced specifically to simplify multi-value case matching in switch statements. So your observation that it works is totally expected if your environment supports modern JavaScript standards.

Key points to consider: #

• Legitimacy & Standard Support: This syntax is defined in the official ECMAScript specification, so it’s not some non-standard IDE trick. It acts as a cleaner alternative to the classic fall-through pattern (case hi: case hello:) while behaving exactly the same way—matching any of the listed values and executing the associated code block.
• Compatibility Risks: The biggest potential issue is environment support. If your project needs to run on older browsers (like IE11, Chrome < 101, Firefox < 98) or Node.js versions prior to 16.0.0, this syntax will throw a syntax error. If you’re using a transpiler like Babel or a build tool (Vite, Webpack) with modern JS support enabled, it can be transpiled down to compatible code for older environments.
• Tooling & Linting: Most modern IDEs (VS Code, WebStorm) and linters (ESLint) recognize this syntax now, but double-check your linting rules if you run into unexpected warnings. For example, the no-duplicate-case rule won’t flag this syntax since it’s a single case clause with multiple values, not duplicate case labels.
• Readability & Maintainability: The comma-separated syntax is undeniably more concise and readable than the fall-through pattern, especially when matching multiple values. It makes your intent clearer at a glance.

When is it safe to use? #

If your target runtime environments support ES2022 or later, or you’re using a transpilation setup to handle older environments, this syntax is completely safe and recommended for its cleaner style. If you can’t rely on transpilation and need to support legacy environments, stick with the classic fall-through pattern to avoid runtime errors.

内容的提问来源于stack exchange，提问作者ShadowCrafter_01