⤴️try-catch-finally

🚧 under construction

• JS ⟩ statement ⟩ control flow ⟩ jump ⟩ try-catch-finally

• JS ⟩ error ⟩ handling ⟩ try-catch-finally

(statement)

try { ... }            // run code that may throw.
catch (err) { ... }    // error handling (and∨ rethrow)
finally { ... }        // cleanup code

🧨 雷區

一但使用 try，一定要用 catch(err) 去抓「所有的錯誤」，否則可能會漏掉「自己沒有預期的錯誤」❗

try {
  noSuchFunc();  // ⛔ ReferenceError (not catched)
} catch(err) { 
  // `console.log(err)` omitted ... (dangerous)❗
  // or, `throw err` omitted ...
}
// the code will continue executing happily❗

⭐️ 重點

👥 相關

📗 參考

📘 手冊